Revelstoke, British Columbia ? An avalanche that killed two people at an informal snowmobile rally in Canada’s Rocky Mountains may have been triggered by three daredevil sledders who apparently unleashed a deadly wall of snow on up to 200 people below, witnesses said Sunday.

RCMP Cpl. Dan Moskaluk told a news conference Sunday that two men are confirmed dead, not three as reported earlier in the chaotic hours after the slide.

Moskaluk later said the search is over. The slide struck around 3:30 p.m. Saturday on Boulder Mountain.

Moskaluk said they believe the slide was triggered by a stunt known as high-marking — a contest to see who can race up a slope and leave the highest mark.

But he declined to say whether the riders responsible have been identified, nor would he say whether they could face charges.