A search took place on the morning of August 16 at a house on the Hattersley estate in Tameside, Greater Manchester, as part of a search for wanted murder suspect Dale Cregan, the Press Association said.
The 29-year-old has been charged with the murders of PC Nicola Hughes, 23, and PC Fiona Bone, 32, at a different address on the estate on Tuesday.
The two officers were responding to a report of a burglary in the area.
Cregan is also accused of killing David Short, 46, and his 23-year-old son Mark, who died in separate attacks earlier this year.
The suspect, who faces four additional charges of attempted murder, is to appear in custody at Manchester City Magistrates' Court later.
Police are continuing to question another man, Stephen Garvey, 28, who was arrested on suspicion of conspiracy to commit murder.
The Press Association reported no arrest was made in relation to the August 16 search. No one from Greater Manchester Police was available for comment.
Following the deaths the Chief Constable of Greater Manchester Police, Sir Peter Fahy, said the house in Abbey Gardens where the officers were called to was not known to them.
"It has not featured in this particularly huge inquiry we have undertaken," he said.
“So it would be routine to have unarmed officers sent to the scene."
The investigation into the murders of David and Mark Short involved officers on armed patrol 24 hours a day, seven days a week, in the Clayton and Droylsden areas, he added.
But he explained that "clearly we cannot send armed officers to the hundreds of incidents we get not only in these areas but also in other areas".
He said: "These were two officers going about their normal duties. Like all officers, they went to a variety of incidents not knowing what it was that they would face."
Sir Peter has praised the constables as "two wonderful human beings, two very dedicated officers".
Mark Short died from a gunshot wound to the neck after a gunman opened fire in a pub in Droylsden, Tameside, on May 25.
The body of the his father was found at a house in Clayton, Manchester, on August 10, following reports of gunshots and a grenade explosion.
Cregan is charged with the attempted murders of Michael Belcher, Ryan Pridding and John Short on May 25 and Sharon Hark on August 10.