Boulders as large as delivery vans fell hundreds of feet, destroying a chalet-style house and killing a middle-age couple in Rockville, Utah.

Mayor Dan McGuire described a gruesome scene with rescuers finally reaching the victims early Friday. He said nearby houses remain in danger.

The Utah Highway Patrol took geologists to the top of the cliff by helicopter to examine the dangers. McGuire said the $380,000 house was "totally flattened" Thursday evening. "It was just like an explosion" that left a huge cloud of dust. The sandstone blocks fell 200 to 300 feet from the top of the cliff, helped by recent freeze-thaw cycles, he said. The community is in "complete, utter shock not being able to comprehend what happened," he said. - AP