No one was seriously injured Monday when a Des Moines Fire Department ambulance collided with a sport utility vehicle and flipped over in the 4000 block of Douglas Avenue. Fire Department spokesman Brian O’Keefe said the accident happened about 3:15 p.m. when the SUV, which was westbound on Douglas, struck the northbound ambulance, with two medics, a passenger and an elderly male patient aboard. The ambulance’s siren and flashing lights were on. The four people in the ambulance – the male patient had been picked up on a medical call minutes earlier for a nontraumatic, ongoing medical condition – were taken to area hospitals. The female driver of the SUV was unhurt, as was her child in a car seat, O’Keefe said. O’Keefe said investigators had not determined what caused the crash, which shut down Douglas Avenue for about an hour. The identities of those involved were not available Monday evening. The injuries resulting from the accident were not serious.