One man says his daughter heard the shooter exclaim "Allah Akbar" as he opened fire.

The family from northern Utah agreed to talk to us, on the condition we not identify them and blur out some photos they've supplied, because they're worried their daughter could get in trouble with her superiors for making public what she told her family she saw.

He told KSL News soldiers were sitting in a staging area for medical and dental checks when the group was startled by gunfire. "A person behind counter stood up, and he said, ‘Allah Akbar!' And just opened up on everybody," the father told us.

Again, that's what the man tells us his daughter said, but no one else is saying that and we cannot confirm whether it's true. He, himself a military veteran, says at first his daughter thought it was some sort of drill but quickly discovered it wasn't. He says he contacted KSL because he thought people should know what happened there.