More than a dozen people were injured, four critically, after a Santa Clarita city bus, a gravel truck, and a white sedan collided Wednesday morning at Centre Pointe Parkway and Golden Valley Road.

The major crash prompted a massive emergency response, with 10 ambulances called to the scene as Los Angeles County Fire Department crews conducted triage.

One person was trapped in the wreckage and had to be freed, according to The Signal .

More than a dozen people were injured. KTLA

10 ambulances were called to the scene. KTLA

One person was trapped in the wreckage and had to be freed. KTLA

Authorities said the crash involved a Santa Clarita city bus, a truck, and a white sedan.…