Investigators picked through the gnarled wreckage Monday of two small planes that collided near an airport, killing five people — including one on the ground — and raining debris and bodies down on car dealership parking lots.

The two small Cessnas crashed at 3:35 p.m. Sunday (2335 GMT) about a mile (1.6 kilometer) from the small Corona Municipal Airport, authorities said.

Two people were killed from each plane, and a fifth was killed inside a Chevy dealership hit by wreckage, said Wayne Pollack of the National Transportation Safety Board.

"There were bodies falling out of the sky," eyewitness Hector Hernandez told KCBS-TV. "One of them crashed into the top of a Ford Mustang, and another one fell not too far behind that one on the parking lot."

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Federal investigators had yet to cut all the way through the wreckage of one of the planes, and were unsure about the number of passengers.

"Until we open that aircraft up we cannot be certain how many people were on board," Pollack said.

The smashed fuselage of one of the planes landed atop a parked car. A wing from one of the planes sat in a parking lot. The debris was contained mostly within a 300-yard (274-meter) radius, said Pollack, although some pieces were found as far as 1,000 yards (914 meters) away.

"The smaller aircraft ... just disintegrated into pieces, maybe fifty pieces coming down," eyewitness Jeff Hardin told KABC-TV. "The other aircraft pretty much stayed intact and started spiraling down and came down right behind the Nissan dealer."

One of the planes, a Cessna 172, is registered to William A. Reinke of La Habra, California, according to aircraft databases. Reached at his home Sunday night, Reinke declined to say who was flying his plane or who might have been on board.

"I only know what happened off the television," he said.

Pollack said investigators had not yet obtained a flight plan.

Federal Aviation Administration spokesman Allen Kenitzer did not immediately know where either plane was headed or whether there were any distress calls. The Corona airport does not have a staffed control tower.