The producers of Academy Award-winningAlex Gibney’s No Stone Unturned has withdrawn the film from the upcoming 2017 Tribeca Film Festival citing outstanding legal issues. The film was to have its World Premiere on Sunday April 23.

The documentary takes a look back to 1994, in Loughinisland, Northern Ireland where six men were gunned down and five wounded in a pub while watching a World Cup soccer match. With a police investigation that was perfunctory at best, the case remained unsolved. In this film, Gibney reopens the original case to investigate why no culprit was ever brought to justice.

In a statement, the festival said, “We were notified today from the producers of Alex Gibney’s No Stone Unturned that there are outstanding legal issues surrounding the film and they will need to withdraw the documentary from the Festival. We are very disappointed that audiences will not be able to see the film at Tribeca and we know Alex is equally disappointed that his film will not have its world premiere at the Festival.”

The festival has removed the film from the website and refunded the customers who have purchased tickets.

The producer Trevor Birney, Fine Point Films said in a statement, “We are bitterly disappointed that as a result of ongoing legal issues relating to the subject matter of the film, No Stone Unturned (Director: Alex Gibney) is not yet ready to be screened at Tribeca 2017. No one will feel this disappointment more than the families at the centre of the film, whose quest for justice has been both inspiring and unstinting these last 23 years. It is our deepest hope that these sensitive issues can be resolved as soon as possible so that we can share this important film with the world.”