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DENVER -- Denver police are looking for a person who shot at a field campaign office for President Obama in Denver Friday afternoon.

Police say there were people inside at the time of the 3:00 p.m. shooting, but no one was hit.

The bullet shattered a window at the West 9th Avenue office, causing an unknown amount of damage.

Police are reviewing surveillance video for possible leads. Investigators say they have a "vehicle of interest" and are interviewing witnesses.

An Obama campaign spokeswoman declined to comment.