The Metropolitan Police said an investigation involving multiple countries was ongoing after "several fires involving cargo".
The fire at a DHL depot in Birmingham in July 2024 has been linked to other incidents on the continent.
A 38-year-old Romanian national was arrested in the UK last year on suspicion of assisting a foreign intelligence agency. He was released, but remains under investigation.
Deputy Assistant Commissioner Vicki Evans said Russian military intelligence is believed to be responsible.
Four parcels were sent from Lithuania to addresses in the UK and Poland in July 2024, a joint statement from European investigators revealed.
One caught fire in transit at Leipzig airport, where it was about to be loaded on to a plane, another exploded inside a truck in Poland, one was seized intact, and the other was the Birmingham incident.
"Test packages" were also sent to the US and Canada, while two more parcels bound for North America were intercepted in Amsterdam.
Twenty-two suspects have now been identified in Lithuania and Poland suspected of working on behalf of Russian military intelligence, according to Eurojust, the judicial arm of the EU.
The agency said the alleged perpetrators were recruited and given instructions through an online messaging service.
Investigators said tasks were divided among several suspects, who were often rewarded with cryptocurrency payments.
They came from various Slavic and Baltic nations, and were "often in a vulnerable socio-economic situation", according to Eurojust.
Two of them now face trial, with courts expected to hear their cases later this year.
All told, five nations - UK, Germany, Netherlands, Poland and Lithuania - took part in the investigation: .
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DAC Evans said: "The strength of cooperation in this case has led us to collectively identify what we believe to be Russian military intelligence involvement in a series of incidents across Europe.
"Our investigation is ongoing, and we continue to liaise closely with partners to ensure we're doing all we can to keep the sector, and the public safe.
"We have been clear and open about the increasing levels of demand we're seeing relating to the activity of foreign states here in the UK."
Officers questioned the women, in their 40s, 50s, and 60s, on suspicion of the following offences: Aiding and abetting rape and sexual assault; assisting the commission of sexual offences, and human trafficking for sexual exploitation.
The three women were questioned between Wednesday 25 February and Thursday 5 March.
No arrests have been made and the investigation into al Fayed's abuse is continuing.
To date, 154 victims have come forward and reported allegations of sexual assault, rape, sexual exploitation and human trafficking.
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Commander Angela Craggs of the Metropolitan Police said: "Today's update marks an important step in a complex and far reaching investigation".
"While al Fayed is no longer alive to face prosecution, we have always been determined to bring anyone who is suspected to have played a part in his offending to justice."
She encouraged anyone with information to come forward.
Militant fighters stormed the town of Ngoshe in Borno state on Friday, Bulama Sawa, an official from the Gwoza area said.
No group has claimed responsibility, but it was likely in retaliation for the killing of three commanders of the Boko Haram militant group by Nigeria's military, he said.
Separate attacks also took place in the communities of Konduga, Marte, Jakana and Mainok between Wednesday and Friday, according to military spokesman Uba Sani.
He said troops repelled those attacks, but a "number of brave soldiers paid the supreme price in the line of duty", along with a senior officer.
Mr Sani did not elaborate on military casualties and there was no detail on casualties resulting from the incident.
He described the assaults as "failed attacks" which illustrated the "increasing desperation of terrorist elements under sustained operational pressure" across the theatre.
Mass kidnappings are increasingly common in Nigeria, with armed gangs targeting remote communities where security and government presence is limited.
Ulf Laessing, from the Konrad Adenauer Foundation thinktank, said that the military struggles to control large parts of the country where jihadi groups operate.
Militants are also using drones to scout out targets and benefiting from increased cross-border cooperation between groups, he said, adding that the army "is fighting a ghost - fighters descending with motorbikes on villages and disappearing into the bush before the army can respond in time".
Among the most prominent Islamic militant groups are Boko Haram and its breakaway faction, which is affiliated with the Islamic State group and known as Islamic State West Africa Province.
There is also the IS-linked Lakurawa, as well as other "bandit" groups that specialise in kidnapping for ransom and illegal mining.
Recently, the crisis has worsened to include other militants from the neighbouring Sahel region, including the Jama'at Nusrat al-Islam wal-Muslimin, which claimed its first attack on Nigerian soil last year.
In January, armed bandits kidnapped more than 150 Christians in simultaneous attacks on a number of churches in the west African country.
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In November, gunmen abducted more than 300 pupils and 12 staff from a Catholic school in Niger state.
Some escaped; others were rescued while the remaining 130 children being held were freed just before Christmas.
Several thousand people in Nigeria have been killed, according to data from the United Nations.
Analysts say not enough is being done by the government to protect its citizens.
While there are often briefings out of cabinet and Parliamentary Labour Party meetings, revealing details of top-secret talks held by the NSC "should be a red line", the former deputy Labour leader said.
Her comments on Sky's Electoral Dysfunction podcast come after intimate details of NSC deliberations held just preceding and following the beginning of the US-Israeli war on Iran were revealed by The Spectator.
The magazine reported that at a meeting last Friday, Sir Keir Starmer wanted to allow the US to use British bases for political reasons, but was blocked by four cabinet ministers, led by Energy Secretary Ed Miliband.
The prime minister then agreed to it for defensive purposes on Sunday after the US made a formal request the previous day.
Although Sir Keir has said there was not a "specific decision to be made" on the Friday, the government has not denied the story, so this appears to be the first leak of top-secret NSC deliberations since 2019.
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Speaking to our political editor Beth Rigby on the Electoral Dysfunction podcast, Baroness Harman hit out at the leaker or leakers, saying national security discussions need to be held in private.
She said: "The prime minister has got to be able to go to his NSC and discuss issues with colleagues - that's how government functions."
'Red line' has been crossed
Details of cabinet meetings and weekly meetings of Labour MPs often leak, and although Harman "disapproves" of that, "it's not the end of the world".
"But there should be a real red line against briefing out of National Security Council," she continued.
"It's particularly worrying because it seems the briefing is not criticising the decision. They're supporting the decision, but they're just saying it wasn't Keir Starmer's original decision - he was just overridden by other members of the cabinet.
"So I think it's utterly dysfunctional and destructive, and I thoroughly disapprove of it. I'm really dismayed about it.
"Any prime minister needs to be able to discuss with the cabinet colleagues in the NSC and actually not be undermined."
Former Scottish Conservative leader Ruth Davidson agreed, saying the NSC should be "a sacrosanct space where the most top-level security people" are "able to discuss things and make decisions in the national interest".
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Leaks from the NSC are rare, and the last time conversations appeared in the media was in 2019, when contents of two meetings were published in newspapers.
In September that year, details of an NSC meeting about bringing back the British children of Islamic State fighters in camps in northern Syria were published by the Mail On Sunday.
Before that, in April, details of an NSC meeting about whether Chinese firm Huawei should be involved in the UK's 5G network were published in The Daily Telegraph.
Then prime minister Theresa May launched an internal leak inquiry, which led to the firing of the then defence secretary, Sir Gavin Williamson, although he denied being responsible.
Downing Street has not said if Sir Keir has launched an inquiry after the leak of last week's NSC meetings.
The US and Israel launched a crippling air campaign on Saturday, devastating Iran's security forces across the country, particularly in the Kurdish areas bordering Iraq.
In recent days, Kurds inside Iran say even small outposts belonging to Iranian security forces have been flattened.
Could this ultimately pave the way for a cross-border operation by a coalition of Iranian Kurdish groups?
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For security reasons, none of the groups can reveal how many active members they have, but it is estimated that all the parties together have around 5,000-10,000 fighters.
This number does not include Iraqi-Kurdish fighters, who would not necessarily take part.
Iranian-Kurdish groups have extensive secret coordination cells inside the Kurdish region in Iran, and even in Tehran itself.
Potential to inspire uprising
Sources within the groups say that if Peshmerga fighters - security forces in the Kurdistan region - cross the border from northern Iraq into Iran, these networks and their supporters would join the fighters in securing the Kurdish region.
Some even believe that this could inspire an uprising by non-Kurdish Iranians.
"If the Peshmerga secure the Kurdish region, thousands of non-Kurdish Iranians will join them to finally free Iran," one resident in Tehran said.
The Iraqi Kurds have been put in a difficult position. The US is a critical partner for the Kurdish authorities in Iraq, providing political as well as military support in terms of training, equipment and funding to the Iraqi Kurdish peshmerga forces.
But the Iraqi Kurdish authorities also have cordial diplomatic and commercial relations with Iran. Indeed, Kurdish officials, including President Nechirvan Barzani, say they will not allow their territory to be used to launch an attack on their neighbour.
Tehran said that it will not tolerate any incursion from Iraqi Kurdistan, and will target the Kurdistan Regional Government (KRG) if this happens.
Who are these Iranian Kurdish groups that could act as boots on the ground inside Iran?
Kurdistan Democratic Party of Iran (KDPI)
Established in 1945, KDPI is the oldest party, and has widespread support across the Kurdish area in Iran.
The party's manifesto, which called for autonomy for Kurdistan and democracy for Iran, has championed an autonomous region for the Kurds inside a united Iran that is secular and democratic.
The KDPI and another leftist group, Komala, tried to negotiate with the regime in Tehran after 1979 to secure equal rights for the Kurds.
But the negotiation broke down, and KDPI and Komala launched an insurgency which lasted from 1980 to 1988, when the Kurdish groups were forced out of Iran into Iraqi Kurdistan, where they have been ever since.
The leader of the group, a professor of economics called Abdul Rahman Ghassemlou, was assassinated by Iranian agents posing as peace negotiators in Vienna in 1989.
In recent years, the IRGC has fired several barrages of ballistic missiles and suicide drones at the camps of the KDPI and other Kurdish opposition groups in Iraqi Kurdistan, killing dozens of fighters and their family members.
Kurdistan Freedom Party (PAK)
PAK is a radical Kurdish party established in the early 1990s in Iraqi Kurdistan.
The founder, Saeed Yazdanpanah, was killed by Iranian intelligence operatives in the 1990s as part of an assassination campaign by the IRGC and Iran's intelligence ministry in Iraq.
The group is a strong ally of the Iraqi Kurdistan's ruling party, the Kurdistan Democratic Party (KDP), led by President Masoud Barzani.
The PAK Peshmerga have a reputation as fierce warriors, and were a part of the international coalition against Islamic State. They received training and weapons from the American-led coalition.
Komala Party (Komala)
The party, which operates under three branches, is a leftist-nationalist party established in 1979 in the aftermath of the Iranian revolution.
The group set a precedent in 1979 for recruiting thousands of young Kurdish women into its ranks, and fought bloody battles against the IRGC.
Kurdistan Free Life Party (PJAK)
The PJAK was established in 2004 by Iranian Kurdish members of the Kurdistan Workers Party (PKK) and Kurdish students from inside Iran. The PKK had fought the Turkish state for over four decades.
At least 300 members of the group had just returned from Syria, where they fought against ISIS as part of the Syrian Democratic Forces (SDF) affiliated with the US-led coalition.
The PJAK has operated small units deep inside the Kurdish areas for years, living in the rugged Kurdish mountains.
In 2011, PJAK fighters clashed with the special forces of the IRGC known as Saberin Units in the Qandil mountains straddling the Iran-Iraq border and inflicted heavy casualties on the IRGC.
The group is based in the border areas in Sulaymaniyah province in a network of sophisticated tunnels in the mountains, which has protected them from Iranian missiles and drones.
"It would take us less than three hours to take, for instance, Marivan city," one official from PJAK said, referring to a border city in the Kurdish region.
"But we need to make sure that our people will be safe once we take the cities, and that means US air cover for Kurdish fighters."
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Several hundred fighters said to be ready to cross the border are Iranian-Kurdish veterans of the war against the Islamic State in Iraq and Syria, who fought closely alongside US, British and French special forces.
And Kurdish sources say that hundreds of former Peshmerga fighters have returned from Europe, the UK and even North America to take part in any potential operation.
Thousands of light arms have been smuggled into the Kurdish areas in Iran in recent years, a Kurdish intelligence official noted.
When asked about whether the CIA and Mossad have provided weapons to the Kurds, the official added that they are not a proxy of any country, and are fighting for equal rights in Iran.
"The most important thing right now is close air support for the Peshmerga once they cross back into Iran," they said.
Another official from one of the other Iranian-Kurdish groups said the short-range ballistic missiles that Iran still retains could rain fire on Kurdish areas if the US does not provide air support, making any mission into Iran suicidal without that agreement.