Irish documentary The Summit has scooped one of the top prizes at the Sundance Film Festival in the US.

The award for editing went to Ben Stark for his work on the documentary.

Directed by Nick Ryan, The Summit tells the tragic story of Irish climber Ger McDonnell, who was killed attempting to climb K2 along with his fellow mountaineers.

Producer Olivia Leahy said that their film caught the judges' attention by "telling the story from each of the climbers' points of view, and keeping the emotion in it, that people died on the mountain that day, as well as all the controversies".

Fruitvale, a film about a notorious US police shooting of an unarmed black man, won the top prize. The movie - by rookie director Ryan Coogler - took the US drama Grand Jury award, as well as the US drama audience award.

The Grand Jury prize for a foreign drama went to Jiseul by South Korea's Muel O, while Cambodian Kalyanee Mam's A River Changes Course took the Grand Jury prize for a foreign documentary.

The makers of a film about Russia's Pussy Riot feminist group, which took a Special Jury prize, used their acceptance speech to hail the cause and rally support for its three members jailed in Moscow last year.