Updated 05/20/12 – 3:36 p.m.

CHICAGO (CBS) — Three Chicago firefighters have been hospitalized, after suffering heat-related problems while battling an extra-alarm fire at a historic North Side park.

The firefighters were battling a 2-11 alarm fire at the fieldhouse at Indian Boundary Park, 2500 W. Lunt Av., when they became overheated Sunday afternoon, officials said.

A mayday call went out while firefighters were on the scene, after part of the roof collapsed at the fieldhouse, but all firefighters had gotten out of the building by that point, according to the Fire Department.

The two injured firefighters were taken to a local hospital in good condition. Temperatures in Chicago were in the high 80s early Sunday afternoon.

The fire caused severe visible damage to the roof of the fieldhouse.

According to the Chicago Park District website, the fieldhouse was designed by architect Clarence Hatzfeld. It features Native American-themed ornamentation, taken from a territorial boundary established between the Pottawattomie Indians and United States Government. The inside also features an auditorium and stage, used for theater productions, concerts, community meetings and private rentals.

Detailed damage estimates were not immediately available.

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