EXTRA garda units including armed ERU officers are being drafted in to halt a bloody backlash over the murder of Darren Cogan.
The 20-year-old, shot dead in the Black Horse Inn in Inchicore on June 25, was the victim of a gun attack by a faction of the Crumlin/Drimnagh feuding gangs.
Detectives are following a definite line of inquiry that "young bloods" in a gang known as The Dirty Dozen are responsible.
They believe the gunman was a nephew of a high-profile criminal aligned to Fat Freddie Thompson (right).
They are also working on the theory that the driver of a getaway car is the son of another man who has a close association with the gang leadership.
It is understood that intelligence information suggests that a gang based in Inchicore known as The Dirty Dozen and led by a man with known dissident IRA connections is set on retaliation.
The leader has serious previous convictions and is under constant observation. He has strong connections to the 'King Ratt' gang.
An innocent man, Jamie Behan, was shot and wounded in the attack but is reportedly not in danger and is expected to make a full recovery.
The various factions and splits over petty issues within gangs in the Crumlin/Drimnagh area is causing huge headaches for the gardai in south Dublin, sources told the Herald.
The latest murder has its origins in a long-running dispute with members of one family, but other outside background influences have "muddied the waters" in efforts to establish a clear motive for the killing, the Herald understands.