Hollywood star Liam Neeson and fellow Northern Irish actor James Nesbitt have appealed to the IRA and other Republican organizations to disclose new information about the "disappeared" of the Troubles.

Seventeen people, one woman and 16 men were murdered and buried at undisclosed locations, mainly by the IRA, during the Troubles. To date ten bodies have been recovered after details were given to the Independent Commission for the Location of Victims' Remains (ICLVR) which was established by the British and Irish government in the wake of the 1998 Good Friday Agreement.

Seven bodies have never been found. On Friday a day of reflection was held to to commemorate the disappeared.

The two actors made the appeal to coincide with the launch of a new book, ‘The Disappeared Of Northern Ireland's Troubles’, which shares the stories of 14 of the families.

"The pain caused by the murder of a relative is almost unimaginable,” Neeson said, in a joint statement with James Nesbitt.

"The pain of not knowing where that murdered relative has been secretly buried and the family denied the chance to properly grieve is almost unbearable," he said.

"While it is rightly acknowledged how far Northern Ireland has come as a result of the peace and political processes those seven families remain in a cruel and inhumane limbo," added the Hollywood star.

Speaking about the history of the Troubles before, Neeson told IrishCentral : "I never stop thinking about it."

"I've known guys and girls who have been perpetrators of violence and victims. Protestants and Catholics. It's part of my DNA."