14-year-old girl walking dog suffers life-threatening injuries in SF collision

A 14-year-old girl suffered life-threatening injuries Friday evening in a collision with a vehicle in San Francisco, police said. 

The collision occurred at 6:15 p.m. in the 600 block of John Muir Drive along the west side of Lake Merced. 

Police said the girl was taken to a hospital. She was out with her mother walking their dog when the collision happened, police said. 

According to police, the girl's mother was taken to a hospital with injuries not considered life-threatening.