(CNN) -- A regional airline plane flying from Billings, Montana, had to make an emergency landing about 150 miles from its final destination of Phoenix, Arizona, Sunday, according to Federal Aviation Administration spokesperson Ian Gregor.
Allegiant Flight 645 was diverted to Flagstaff, Arizona, at 10:37 a.m. MT (12:37 p.m. ET), Gregor said.The agency is investigating whether a possible engine fire forced the landing.
Initial reports state that seven passengers received minor injuries including scrapes and bruises while evacuating the aircraft via the plane's emergency slides, he said.
