PHILADELPHIA (CBS) – Authorities battled a fire at an auto repair business Friday morning in the Overbrook section of the city.

The blaze broke out around 4:45 a.m. in a locked lot at 61st and Lebanon.

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Authorities say police and fire crews had a tough time gaining access through the locked gate.

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Officials say at least three cars were on fire.

There were no reported injuries.

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The cause of the fire remains under investigation.