PHILADELPHIA (WPVI) -- Philadelphia police say someone set fire to a vacant Philadelphia Housing Authority building on Monday morning.
The fire department was called to the PHA property at 20th and Chestnut streets around 9:30 a.m.
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They got the flames under control within 30 minutes.
Investigators soon determined the fire was set intentionally.
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No other properties were damaged.
Anyone with any information is asked to call police.