Another 18 people have been transported to hospitals, authorities said.
At least three people were killed in a bus rollover on Interstate 15 near San Diego, authorities said.
Another 18 people have been transported to local hospitals, according to a Twitter post from North County Fire Protection District.
No other vehicles were involved in the accident, authorities said at a press conference.
The driver of charter bus appears to have lost control and went over the side of the embankment. It was raining at the time.