They were last seen almost two weeks ago

Helicopters began searching on Saturday for two Americans who went missing while attempting to climb one of Pakistan’s highest peaks.

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Kyle Dempster, 33, and Scott Adamson, 34, began climbing the north face of Ogre II, near the Choktoi Glacier in northern Pakistan, on Aug. 21, according to a GoFundMe page established to support their rescue. The men, both from Utah, were last seen on Aug. 22, a day before a snow storm hit the mountain. Dempster and Adamson had originally planned on spending five days climbing and descending the mountain.

The search-and-rescue effort began on Sunday, but stormy weather made it impossible for Pakistani military helicopters to join the search until Saturday, CNN reported, citing a family spokesperson.

A U.S.-based rescue group also planned to send two helicopters to help with the search, NBC News reported.

The pair had tried climbing the same peak last year, but ended the trip after Adamson fell and broke his leg, according to CNN.

Source: TIME