The president of Flagstaff Medical Center says the collision of two medical helicopters on their way to the hospital Sunday is a tremendous loss.

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Two medical helicopters collided Sunday afternoon about a half-mile from a northern Arizona hospital, killing at least seven people and critically injuring three, a federal official said.

All three people on one of the helicopters were killed in the Flagstaff collision, including a patient and the pilot, said Ian Gregor, spokesman for the Federal Aviation Administration.

Four others were killed and three critically wounded, Gregor said. He wasn't sure if they were all on the second helicopter or whether some were on the ground.