Garda-killer Adrian Crevan Mackin had pistol and 700 rounds of ammunition for 'bigger attack'
Garda-killer Adrian Crevan Mackin was planning a much bigger attack than that which was foiled by the intervention of Garda Tony Golden, investigators believe.
Gardaí recovered a second high-powered Glock automatic pistol and 700 rounds of ammunition hidden in his Crevan Mackin's car after the gun attack on his former partner and the Garda, along with a number of cans filled with petrol.
A psychologist had also assessed Crevan Mackin as "extremely dangerous" and likely to pose a serious threat to others, particularly his partner Siobhán Phillips.
The Irish Independent understands that a report on the 24-year-old, who was on bail for IRA membership, was compiled at the behest of the North's social services.
As revealed by this newspaper yesterday, he had threatened the lives of two female social workers in Northern Ireland who were investigating him for domestic abuse against his former partner.
As a result of the incident, which was being investigated by the PSNI, the Northern authorities asked a psychologist to review the extensive file they held on him and give them an assessment.
"The report assessed him as being extremely dangerous with the capacity for extreme violence, including murder," an informed source said.
The same source also claimed that the alarming report had been sent to the PSNI but its contents were not known to the gardaí south of the Border where Crevan Mackin had moved to live with Ms Phillips.
Gardaí found a high-powered Glock automatic pistol and 700 rounds of ammunition hidden in his Crevan Mackin's car, along with petrol cans.
Gardaí believe they will find more ammunition and possibly weapons when they start a search of the house in Omeath where he shot his partner and Garda Golden and took his own life with a Glock. The search is expected to start tomorrow and take several days.
Investigators believe that Crevan Mackin would have shot anyone else who entered the house on Sunday evening.
"The second hand gun was a working firearm and was found with a very large quantity of ammunition in the car and cans of petrol... it is clear that Crevan Mackin was planning a much bigger attack last Sunday evening," he said.
"As the background to this horrific incident is being unravelled, it is becoming clear that Crevan Mackin was intent on murder and may also have been contemplating attacking Siobhán's family.
"The picture that is emerging is of a completely out-of-control, extremely violent individual.
"There will be questions to be asked in coming days and weeks as to why more information was not sent to the Garda authorities because it may have changed the way gardaí approached Mackin," the source added.
Crevan Mackin, who shot his partner Ms Phillips several times, leaving her critically injured, had been involved in reactivating decommissioned handguns, which he was supplying to criminal gangs and terrorists.
He had been ordering deactivated guns online from firms in the US which he then received by post. The sale of such weapons is legal once the operating parts and firing mechanisms are removed.
Separately, he was also ordering gun parts online, which he then used to reactivate the replicas as lethal weapons.
It was still unclear last night if the two weapons seized by gardaí had also been reactivated in the same way.
Crevan Mackin was already well-known to gardaí and the PSNI for his involvement in a break-away faction of the Real IRA and had been spotted regularly in the company of "major players" in the various paramilitary gangs.
But a source said that Crevan Mackin was not trusted by the other IRA factions and had been thrown out of a number of them.
"He was known as a pure mad man who had some pretty depraved sexual preferences, which is why he went from one gang to the other, because none of them wanted him," the source said.
Gardaí were still searching the house where the murder-suicide took place yesterday and sources say this may continue for some days.
Ballistics experts have been examining the weapons recovered to discover if they had been used in the past, and detectives are trying to trace the source of the large amount of ammunition.
In a separate development, up to 40 extra officers are to be seconded to Dundalk.
Belfast Telegraph Digital