SAN FRANCISCO (AP) - Five people were injured Wednesday when a San Francisco cable car came to a sudden stop in the city's Nob Hill neighborhood, authorities said.
One of the injuries - an elderly man who fell and hit his head - was considered life-threatening, San Francisco Fire spokeswoman Mindy Talmadge said.
Four other people were taken to a hospital with non-life-threatening injuries.
The cable car had about 50 passengers onboard.
San Francisco Municipal Transportation Agency Director John Haley told reporters at the scene that it appeared a 1.5-inch bolt stuck in the cable car's track caused the sudden stop.
Additional details were not immediately available.
Copyright 2015 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.