WATCH: 'Terrifying' Loughinisland massacre documentary due for release this month

A documentary about the Loughinisland massacre in June 1994 will be released in Ireland later this month.

Titled, 'No Stone Unturned', the documentary is directed by Academy Award winner, Alex Gibney.

Six people were gunned down by U.V.F. gunmen in The Heights Bar in Loughinisland in June 1994.

Six people were gunned down by U.V.F. gunmen in The Heights Bar in Loughinisland in June 1994.

Six people were murdered when U.V.F. gunmen burst into a bar in the Co. Down village of Loughinisland and opened fire; five others were injured.

The attack took place while people had gathered inside the bar to watch the Republic of Ireland play against Italy in the 1994 World Cup finals in the USA.

The people killed were Adrian Rogan (34), Malcolm Jenkinson (52), Barney Greene (87), Daniel McCreanor (59), Patrick O'Hare (35) and Eamon Byrne (39).

The film was described by ScreenDaily.com Chief Film Critic, Fionnula Halliigan, as "Long and detailed and frequently terrifying".

The aftermath of the Loughinisland massacre at the Heights Bar in June 1994. Last year, a Police Ombudsman report found there to have been state 'collusion' with loyalists in the run-up to the massacre - though it also said security forces had not known about the planned massacre

The aftermath of the Loughinisland massacre at the Heights Bar in June 1994. Last year, a Police Ombudsman report found there to have been state 'collusion' with loyalists in the run-up to the massacre - though it also said security forces had not known about the planned massacre

Director Alex Gibney won his Oscar in 2007 for 'Taxi to the Dark Side' - a documentary which exposed the haunting details of the USA's torture and interrogation practices during the war in Afghanistan.

'No Stone Unturned' is due to be released in Irish cinemas on November 10.