A 25-year-old man was arrested early Friday morning after setting fire to an occupied West End apartment building, according to the Billings Police Department. 

The fire happened at 3:45 a.m. when the man appeared to intentionally set fire to Halloween decorations on an apartment door at the Grandview Apartments at 1151 28th St. W. 

Police arrested a man who ran from the scene.

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People inside the building were evacuated after the fire set off an alarm, and no one was injured, said Deputy Fire Marshal Jaimie Fender in a press release. 

The fire caused about $500 in minor damages to the door, according to Fender.

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