About four inmates made a bid to flee from the jail in regional capital of Gilgit this morning.
Regional chief secretary Sikandar Sultan said that two prisoners escaped, including Habib ur Rehman involved in the killing of climbers at the Nanga Parbat peak.
He said one prisoner was killed and another injured when security forces resorted to firing at the fleeing men in Gilgit-Baltistan region, a territory disputed between India and Pakistan.
Ten foreign climbers and a Pakistani guide and cook were killed as gunmen wearing the uniform of paramilitary Gilgit-Baltistan Scouts stormed into the base camp of Nanga Parbat, one of the world's highest mountains in 2013.