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This Audi caught fire in the Library Lane parking structure Saturday afternoon in downtown Ann Arbor.

(Courtney Sacco | The Ann Arbor News)

Ann Arbor fire officials are investigating what made an Audi burst into flames in the Library Lane parking structure in downtown Ann Arbor Saturday.

Crews were called to the first level of the underground structure around 3:50 p.m. after receiving reports of a car fire.

Ann Arbor fire Battalion Chief Steve Lowe said no one was in the Audi when it spontaneously caught fire and investigators were trying to track down the owner. The blaze was extinguished in part by the structure's sprinkler and arriving fire crews.

Firefighters pulled the car out of its spot and into the lane of the structure for easier operations.

Investigators were still trying to track down the owner Saturday afternoon.

Numerous fire trucks blocked South Fifth Avenue next to the library for about 30 minutes and motorists were not allowed to get their vehicles out of the structure. Police tape blocked off a nearby entrance to the underground lot. Huron Valley Ambulance was also on scene, but there were no reported injuries.

John Counts covers crime and breaking news for The Ann Arbor News. He can be reached at johncounts@mlive.com or you can follow him on Twitter. Find all Washtenaw County crime stories here.