The fire started before 2 a.m. in the 3600 block of Sunnyside Drive, according to the Riverside Fire Department. Officials say it started at the back of the building and then spread.
The post office sustained about $50-70,000 in damage, but a majority of the mail should be fine, officials added. When crews arrived at the scene, they found a dumpster and a trash can also engulfed in flames in the same area. Officials are investigating the fires as possible arson and a person of interest was detained for questioning. No arrests have been made.
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