SAINT FRANCIS, Wis. (WLS) -- Some tenants in a suburban Milwaukee apartment building were trapped Sunday night after a balcony collapsed.

Firefighters used ladders to help get trapped people safely out of the building.

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A fire inspector said four units are uninhabitable because the balcony was the only way and in out for those tenants.

No one was hurt.

The cause of the collapse is under investigation.

Firefighters say it could be related to last week's historic flooding across the Milwaukee area .

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