Gardaí investigating what they have described as the 'callous' double murder of two men in Dublin last night believe the victims were set up.

23-year-old Mark Noonan from O'Devaney Gardens and 20-year-old Glenn Murphy from the Drumlea Estate were shot dead on the forecourt of the Tesco Petrol Station at Clearwater in Finglas.

Detectives are still trying to establish a motive for the killings. Neither of the men was known to be involved in serious or organised crime.

Post mortems on the bodies were carried out this afternoon.

Both died after they were shot several times in the head and body at 11.42pm last night.

Two gunmen and a driver had been waiting for them in a dark 06 BMW, and drove slowly up beside their grey Avensis and started shooting.

One of the men was shot dead at the shop, the other got back into the passenger seat but one of the gunmen got out of the BMW and fired at him through the glass.

Up to 20 shots were fired at the men.

The men's families remained at the scene throughout the night and much of today.

The men were known as minor criminals but not for involvement with major criminal gangs or organised crime.

Gardaí have appealed for anyone with information or anyone who was in Tesco in Finglas last night to contact them.

They are interested in talking to anyone that may have noticed a Toyota Avensis car registration number 05-D-86211 and a 06-D registration saloon type car, possibly a BMW, in or around the forecourt or general area before or after the incident.