Gardaí investigating the deaths of two men in an attack at a Dublin restaurant on Christmas Eve have arrested a fifth person.

The teenage boy was arrested this morning and is being detained under Section 4 of the Criminal Justice Act and can be held for up to 24 hours.

48-year-old Jason Hennessy was shot during the attack at Browne’s Steakhouse at around 8pm on December 24th and later died in hospital.

A murder investigation has been launched into his death.

One of the alleged gunmen, 26-year-old Tristan Sherry, was assaulted at the scene of the attack and was pronounced dead by emergency services after they arrived.

Gardaí are also conducting a murder investigation in relation to his death.

The teenager is the fifth person to be arrested by Gardaí investigating the attack.

On Wednesday, a man was detained under Section 30 of the Offences Against the State Act before being released with a file to be prepared for the DPP.

It is understood his arrest relates to the wider investigation into all of the circumstances surrounding the attack.

Three other men were previously arrested as part of the investigation.

22-year-old Michael Andrecut, of Sheephill Avenue in Corduff, Dublin 15, has already appeared in court charged with murdering Tristan Sherry.

18-year-old David Amah of Hazel Grove, Portrane Road, Donabate has also been charged with Mr Sherry’s murder.

25-year-old Wayne Deegan of Linnetsfield Avenue, Phibblestown, Dublin 15 has been charged with assault causing harm, violent disorder and producing a knife.