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Five people were killed when two small planes collided over Corona, CA, and debris rained down on a busy commercial strip of auto dealerships.

Four victims of the Jan. 20 accident were aboard the two aircraft that crashed about a mile from Corona Municipal Airport, says the National Transportation Safety Board. The fifth victim was killed on the ground after falling debris, including part of a cockpit, crashed through the roof of a Chevrolet dealership.

At Corona Nissan, salesman Pete Argueta was in his office when he saw a sales manager and four or five other men dashing for cover, screaming: “Run! Run! Run!“

“I thought they were playing,” Argueta tells the Los Angeles Times. “But then I saw small debris falling.”