By CBS 2 Chicago Staff

CHICAGO (CBS)– Firefighters helped people escape an arson at a high rise apartment building in Washington Park.

The fire broke out in the elevator of the building located at near 63rd Street and Michigan Avenue around 9 p.m. Thursday. According to Chicago police, an unknown offender used an incendiary device to start the fire, causing smoke damage.

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Residents said the building started to fill with smoke and neighbors began knocking on doors.

No injuries were reported.

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It is not clear who started the fire, but the arson unit is investigating.

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CBS 2 Chicago Staff