A bus crash south of Las Vegas has injured 29 people, four critically, after their employee shuttle swerved off the interstate and slammed into the center divider.

Nevada Highway Patrol Trooper Kevin Honea says the bus wheels and undercarriage were ripped from the vehicle and strewn all over the I-15 at about 7 p.m. Saturday.

No other cars were struck by the debris and no other injuries were reported.

Honea says the employee shuttle bus was carrying about 31 passengers.

The cause of the accident remains under investigation.