A tour bus flipped onto its side Thursday while on an agricultural sightseeing trip near the Arizona-Mexico border, injuring more than 20 people. Yuma County Sheriff’s Office spokesman Alfonso Zavala said the bus had been on a dirt road near a field and tipped over while attempting to turn on an embankment. It was carrying 52 people. Two of the injured were flown to Phoenix-area hospitals from the crash site, Zavala said. None of the injuries appeared to be life-threatening.