Two men were killed Monday after getting buried in a massive avalanche in Haines Pass in British Columbia.

Three snowboarders, friends from Haines, Alaska, were climbing by foot on a slope near the Canadian border at an elevation of 3,300 feet when they got trapped under the avalanche, according to the Alaska Avalanche Information Center.

Two of the victims, 21-year-olds Zane Durr and Matthew Green, were completely buried and died on the slope, according to the Anchorage Daily News.

The third, 16-year-old Izak Miller, was able to get free and call for help.

"Our prayers are with all members of their families and (our) hearts are broken in their loss," the Haines Volunteer Fire Department said in a statement.

Officials said that the avalanche about 5 feet deep and between about 160 and 330 feet wide was triggered and ran nearly 500 feet before hitting a terrain trap, where the snow piled up to deadly heights.

"These three boys are connected to families -- They're interconnected among themselves, but they are also onto themselves families that have a long history in the community," Haines Borough Manager Debra Schnabel told KTOO of the 2,400-person town.

The exact cause of death is still under investigation.