CHICAGO — Authorities in Chicago say two men have died in an abandoned commercial building blaze that injured more than a dozen firefighters.

A spokesman in the Cook County medical examiner’s office confirmed the deaths today but said he has no information on whether the men were firefighters. The spokesman said he didn’t have their identities and he declined to give his name.

Firefighters were battling the blaze at the one-story building on the city’s South Side when a wall collapsed.

Fire officials said 16 firefighters were injured, with 10 in serious condition and six in critical condition.

Wednesday is the 100th anniversary of the Union Stock Yards fire that killed 21 Chicago firefighters.