Snowfall and cold temperatures in the Denver metro area and mountains this weekend led to icy travel conditions, avalanche risks and closures due to crashes.

Westbound Interstate 70 at mile marker 208, near the Eisenhower Tunnel, was closed after several crashes Sunday morning, including two bystanders who were hit while trying to assist people in other crashes. Colorado State Patrol Trooper Tim Schaefer said the area was expected to remain closed at least until late afternoon.

A semi-truck and two vehicles collided, and some people involved were transported to the hospital for treatment of injuries, he said. Specific details about how the crashes occurred were not immediately available.

A bystander who stopped to render aid was hit, and Schaefer said the person’s injuries are currently unknown, but the bystander was transported to Summit Medical. A second bystander who stopped to render aid was also hit and transported to the hospital.