They stand 17 stories high, are over 1,000 feet long and 300 feet wide.
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The fire authority called in a helicopter overnight to help put out the blaze.
Motorists were asked to avoid the area.

Firefighters work to control a blaze at the north blimp hangar at the former Marine Corps Air Station in Tustin, CAJeff Gritchen/MediaNews Group/Orange County Register via Getty Images
Arson investigators were sent to the scene to determine the cause of the fire.
City News Service contributed to this report.
