A cable car accident in San Francisco left ten people injured Wednesday morning.
The injured included eight five and two cable car workers.
One of the injuries was originally considered life-threatening, according to San Francisco fire officials. That passenger, an elderly man, is now listed in serious condition.
The car's conductor and gripman also suffered minor injuries.
In the end, seven people were taken to the hospital and three were treated on the scene.
The cable car was at the corner of Washington and Powell streets when it made an abrupt stop at about 10:15 a.m.
One person fell off of the cable car during the hard stop.
A bolt in the tracks appears to be the cause, a Muni spokesman told Bay City News. A bolt was reportedly found stuck in the trackway, which caused the inbound Powell-Hyde cable car to stop suddenly.
NBC Bay Area's helicopter flew over the scene and showed the cable car upright and surrounded by maintenance workers. It was being towed to the maintenance yard at 11:30 a.m.
Cable cars are the most popular with tourists, but it was not immediately known who was injured or how many people were on the car at the time.