One unit in an Irvine strip mall was damaged after a three-alarm fire broke out Tuesday evening, authorities said.

The blaze broke out at the 5300 block of Walnut Avenue shortly after 6 p.m., according to Orange County Fire Authority spokesperson Capt. Thanh Nguyen. No injuries were reported, Nguyen said.

The cause of the fire remains unknown, and a crew of 43 was required to knock it down, the OCFA said.

Westbound Walnut Avenue was closed at Jeffrey Road while firefighters worked on the blaze, Irvine Police said in a Tweet around 7 p.m., adding that part of the shopping center was shut down.

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