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FLAGSTAFF, Ariz. — Two medical helicopters collided on Sunday as one was taking off and the other landing, killing at least six people and critically injuring three others, officials said. Three of those killed were aboard one of the helicopters, officials said, and the other three dead and one of the injured people were aboard the second aircraft. The crash occurred near a mesa just east of Flagstaff Medical Center. Debris was spread over a 500-yard area, and one of the helicopters exploded on the ground, setting off a wildfire that burned 10 acres before firefighters brought it under control. Two paramedics with Guardian Medical Service who rushed to the crash scene were knocked to the ground by the explosion and received slight injuries, officials said at a news conference. They were treated at the hospital and released, officials said. The names of the dead and injured were not released. Both of the helicopters were Bell 407 models, according to the Federal Aviation Administration.