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Two firefighters were pulled out quickly, but rescuers had to use extrication equipment to reach the other two.

Mayor Richard M. Daley was out of town but issued a statement offering condolences to the victims’ families. He was cutting his trip short to return home and address the city.

“Our prayers go out to the families of these two firefighters and to their brothers and sisters in the Chicago Fire Department, who put their lives in danger every day to keep Chicagoans safe,” he said.