Gardaí investigating the shooting of three people at a Dublin pub are trying to establish if it is connected to a dispute between criminals and former IRA members.

One line of inquiry is that it could be linked to tension over control of the business of providing security and doormen at pubs around the city.

Two people remain in a critical condition following the shooting outside the Players Lounge on Fairview Strand in the early hours of this morning. A third person is also in hospital.

It is believed the attack was captured on CCTV, which gardaí are now examining. The scene of the shooting was examined this morning.

Gardaí say a lone gunman walked up to the pub at around 12.20am and fired several shots at a group of people outside.

The doorman was hit in the head, while two customers were hit in the chest and back. Gardaí believe the gunman was armed with two handguns.

The getaway car - a Volkswagen Golf - was found burnt-out shortly afterwards at Verschoyle Court near Mount Street.

It was fitted with false Dublin number plates (05-D-57078) and gardaí are appealing for anyone who saw that car to contact them.

The gunman is around 5'8". He was wearing dark clothes and his head was covered.