A Yuma County Sheriff's Office spokesman says the bus flipped onto its side Thursday morning as it went up an embankment while making a turn on a dirt road next to a field.
Office spokesman Alfonso Zavala says the bus was carrying 52 people, including 23 who were hurt. He says two of the injured have been flown to Phoenix-area hospitals.
Zavala says none of the injuries appeared to be life-threatening, but no other details were immediately available.
The bus is operated by Phoenix-based Tour West America. A woman who answered the company's phone says officials are still trying to gather information.