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Two Chicago firefighters were taken to the hospital for observation after battling a 3-alarm blaze in Bridgeport Sunday afternoon.

The quick-spreading fire started on the back porch of a residential building in the 2900 block of S. Lyman St., fire officials said.

Two separate mayday calls went out after firefighters became trapped by a wall of smoke and flames. Two firefighters were taken to Mercy Hospital in good condition.

The fire spread to two neighboring buildings leaving at least 10 people displaced. The cause is under investigation.