Five people were injured Monday when two chairs on a lift collided at Heavenly Mountain ski resort in Lake Tahoe, local media reported. The accident happened days after 174 people were stranded in their gondolas for hours at the Winter Park Resort in Colorado. One witness told NBC Bay Area they saw one of the chairs at Heavenly slide backward and crash into the chair behind it. On Saturday, the chairlift system at Winter Park Resort in Colorado stopped just after noon when it detected a malfunction. Riders had to wait hours before Winter Park Ski Patrol brought them down individually.

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Persons: Heidi Schmitt, Taylor Scotland, that's Organizations: Comet, NBC, NBC Bay Area, Douglas Fire Protection, Patrol, NBC News, Ski Patrol, Colorado Tramway Safety Locations: Lake Tahoe, NBC Bay, Colorado, Reno , Nevada, Denver