Four days into his trial Dale Cregan confessed that he did lure PCs Fiona Bone and Nicola Hughes to Hattersley with a fake 999 call, before killing them.
He still denies the murders of Mark and David Short.
Our correspondent Elaine Willcox was one of few journalists in court to hear his admission.
An image of the Glock handgun found at the scene of the killings of PCs Fiona Bone and Nicola Hughes in Abbey Gardens in Mottram, Hyde, on September 18 last year has been released by Greater Manchester Police.
Preston Crown Court heard that Dale Cregan, who today confessed to the two murders, fired a total of 32 bullets from the weapon at the unarmed officers after luring them to the address with a bogus 999 call.
Earlier today, Dale Cregan pleaded guilty at Preston Crown Court to the murders of PC Fiona Bone and PC Nicola Hughes last year.
These images show Dale Cregan walking into Hyde police station and being arrested on September 18th 2012.
The jury has now been sent home for the day after Dale Cregan dramatically changed his plea to guilty for the murders of PCs Hughes and Bone.
– Our correspondent Elaine Willcox
Dale Cregan stood in the dock and said "guilty" to the murder of PC Nicola Hughes and then "guilty" to the murder of PC Fiona Bone.
The landlord of Cotton Tree pub in Droylsden tells Preston Crown Court he saw the gunman come into pub and heard the sounds of gunshots. He says he tried to help the victims.
The mother of a man - whose murder sparked a series of shootings ending with the deaths of two policewomen - has told a court her son didn't deserve to die.
Michelle Kelly was the first witness in the trial of Dale Cregan and nine others at Preston Crown Court.
She's the mother of Mark Short and was the partner of David Short - both men were murdered in separate shootings last year.
Our correspondent Elaine Willcox was in court to hear her evidence.
The mother of an amateur boxer shot dead in a pub in Greater Manchester wept as she recalled his final moments.
Michelle Kelly was giving evidence at the trial into the murder of four people including two police officers.