The two climbers died in Peru when they______.

A large, hanging and then collapsing chunk of ice is likely the reason why two American climbers died in Peru, an investigator said Monday. The bodies of Ben Home and Gil Weiss were found two days earlier, a heartbreaking end to a high-tech search. The men disappeared while attempting to scale the south face of Pal-caraju Oeste, a 6,110-meter tall mountain located in Huaraz, a region popular with climbers.(9)Ted Alexander, who coordinated an investigation and effort to find the men, said Home and Weiss made it to the summit and ran into trouble on their way down.
     (10)Evidence suggests that one of the men likely went to look over a serac—a large block of ice—to see if they could descend. Something gave out, causing the climber to fall some 65 feet, said Alexander. But because the men would have been tethered together, that first fall likely pulled the other man off the edge, which sent them both spiraling off a large cliff.