(STMW) — A roof collapse during a fire at a South Shore building prompted an increased emergency response Friday night, but nobody was injured.

The fire started in a building in the 8000 block of South Marquette Avenue and was elevated to a two-alarm blaze when the roof collapsed, Fire Media Affairs said. Reports indicate the fire started about 6:40 p.m.

A mayday response — indicating firefighters could be in distress — was called after the roof collapse, but all firefighters were located unharmed, the fire department said.

(Source: Sun-Times Media Wire © Chicago Sun-Times 2013. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)

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