Killer armed with Glock was prepared to murder other gardaí
Murdered garda Tony Golden was killed with a high-powered Glock pistol of a type preferred by gangland assassins and special forces personnel.
Investigators discovered the 9mm Glock automatic beside the body of Adrian Crevan Mackin, who took his own life after shooting his partner and the courageous garda who was trying to protect her.
Sources said there was still a number of bullets in the magazine - which the violent IRA member would have used to shoot anyone else who came into the house.
"The thinking is that he would have kept on shooting until he got everyone and then taken his own life - he had plenty of ammunition," said one source.
It is believed the gun came from a cache of weapons in the possession of the IRA.
Last night Siobhán Phillips was in Beaumont Hospital in Dublin, being treated for a gunshot wound to the head.
"She's still critical. It was an awful tragedy. All we can do now is hope," her grandfather John Phillips told the Irish Independent.
Crevan Mackin was on bail at the time of the shooting at the house in Omeath, Co Louth.
Bail had been unopposed by the State in January this year. He had been caught with pipe bomb components and was charged which membership of an illegal organisation.
Garda Golden will receive a State funeral on Thursday.