Two men have been arrested by gardaí investigating the murder of Darren Guerrine in Dublin more than four years ago.
The 21-year-old was shot in the head at point blank range in an apparent gangland attack on the banks of the Grand Canal at the back of the Jamestown industrial estate in February, 2008.
Guerrine, of La Touche Rd, Bluebell, Dublin 12, had a number of convictions for road traffic offences and public order incidents but the motive for his murder was unclear.
He was facing charges relating to an incident in the midlands when he was caught driving a stolen car and was facing charges of careless driving and drink-driving in relation to the same incident.
The two men arrested today are being held at Kilmainham Garda station under Section 30 of the Offences Against the State Act 1939.
One of the men arrested is in his late 20s and the other is in his mid 30s, a Garda spokesman said.
They can be detained for up to 72 hours.
Four people were arrested and later released in connection with the killing in March, 2008.