DES MOINES, Iowa ( KCCI ) - Des Moines police have launched an internal investigation after this video gained traction online of a rifle on the roof of a police car.

Des Moines police are calling it a serious mistake.

“I thought maybe it was a bike rack at first or something but I kind of seen it hanging over the edge and I was like no ... is that ... ? I think that’s an assault rifle just sitting on top of their vehicle,” said Andrea Jones, who first saw the weapon on the roof near the Des Moines Public Schools Central Campus on the west side of downtown.

Jones said she caught up with the officer at a red light, got out of her car and waved him down.

“I approached him with caution and just told him and he was completely stunned, and I could just tell on his face like he was a little

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