Updated 03/14/13 – 10:37 a.m.

COAL CITY, Ill. (CBS) — Firefighters spent several hours Thursday working to put out an extra-alarm blaze at a warehouse building in far southwest suburban Grundy County.

Crews have been on the scene of the fire at 236 E. Oak St. in Coal City, just west of Interstate 55, since around midnight.

Coal City Fire Protection District spokesman Nick Doerfler said the building housed three businesses; including one that makes drainage tiles, and another dealing in limestone. The building was empty when crews arrived, and no injuries were reported.

Much of the building collapsed in the flames, and firefighters were hampered somewhat because there was no water supply close to the building, so water had to be hauled in with portable tanks fed by tanker trucks that were filling up from the Kankakee River a few blocks away.

The cause of the blaze was under investigation.