Detectives in Northern Ireland have made a fresh appeal for information on the 20th anniversary of a terrorist atrocity, which saw loyalist gunmen open fire in a pub and kill six men.

Soccer supporters were watching a World Cup tie between the Republic of Ireland and Italy in USA 1994 in the Co. Down village of of Loughinisland when the indiscriminate massacre took place.

Six men were killed and five others were injured in the Ulster Volunteer Force (UVF) attack in the Heights Bar - a pub that was frequented by both Catholics and Protestants and well away from the main areas of violence during the Troubles.

To date, 16 people have been arrested, 51 searches have been conducted, 605 statements recorded and more than 2,500 actions raised as part of the investigation.

However, no one has ever been charged with the murders of the six men, namely Barney Green, Adrian Rogan, Malcolm Jenkinson, Daniel McCreanor, Patrick O'Hare and Eamon Byrne.

But the Police Service of Northern Ireland said they were reviewing the case and remained committed to apprehending those responsible for the murders.

Speaking yesterday (Tues) to mark the 20th anniversary of the massacre, PSNI Detective Chief Inspector Gareth Talbot said: "This was a sickening, indiscriminate and completely futile attack committed by terrorists who gave no thought to the innocent lives they shattered, then and now.

"On this 20th anniversary, with all its pain for families and survivors and perhaps reflection for those involved, I would ask anyone with information about the murders to come forward and speak to the police."

He added: "The anniversary should bring into focus the fact that it is never too late to do the right thing, to come forward with any information about individuals or events. Police will not give up, but what we really need is for people to make statements and give evidence."

Irish filmmaker Trevor Birney, who produced a documentary about the massacre, has said it's still a mystery why that particularly pub was targeted by terrorists.

He said recently: "I don't think any of the authorities have ever been able to work out why that bar was chosen.

"There were no links to terrorists in that bar, unlike other bars where there had been some sort of incident before or some sort of knowledge. The police could find nothing that would link the terrorists to that bar and yet, it was the most humble of bars in County Down - [they were] very simple, very proud, but very humble people."

The recent ESPN documantary renewed international interest in the massacre. Watch a clip below: