PHOENIX (AP) _ A passenger grabbed the steering wheel of a Greyhound bus while struggling with the driver on Sunday and caused the vehicle to roll off the road, injuring about 30 people.

No other vehicles were involved, said Officer Hyrum D'Addabbo of the Arizona Department of Public Safety.

The passenger accused of struggling with the bus driver was taken into custody, he said. The identity of the passenger was not released.

The bus originated from Los Angeles and was headed for Miami, Fla.

The struggle occurred around 1 a.m. during the Phoenix-to-El Paso leg of the trip, near Casa Grande, said Greyhound spokeswoman Jamille Bradfield.

``A passenger went to the front of the bus and grabbed the steering wheel and a struggle between the passenger and the driver ensued,'' D'Addabbo said. ``The bus went off the roadway and then re-entered the eastbound lanes and rolled onto its side.''

The injured were taken to area hospitals. The extent of their injuries were not immediately clear.