About two dozen people were on the porch when it fell at about 2 a.m. in the 2900 block of West Lyndale Street on the city's Northwest Side.
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Mikea Johnson, 24, who was on the balcony with her brother and other friends, sustained a leg injury, but expected to recover.
However, Johnson's brother -- Montana Harris - sustained a head injury and remained in critical condition Saturday evening.
"We just stepped out, and I would say I was there for two minutes, before we were falling," Mikea Johnson said.
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She said that the group had flipped over and landed on their backs.
A city building inspector was on the scene Saturday to investigate. A woman who neighbors identified as the owner of the building declined comment on Saturday.
Porch collapse injures at least 4