SAN ANTONIO -- A three-alarm fire at the Alamodome caused an estimated $100,000 in damage and forced the San Antonio Spurs to move their practice Tuesday to Trinity University.

Alamodome officials said the Spurs' game tonight against Dallas, and the Alamo Bowl college football game Saturday would not be affected by the fire.

Smoke poured from vents on the east side of the dome as fire officials searched for almost an hour for the source.

The fire was traced to a storage room where the old HemisFair Arena basketball court floor was smoldering.

"They suspect this thing was smoldering awhile before it ignited into flame," fire spokesman Tommy Thompson said.

Acting Assistant Fire Chief Paul Villarreal said that little burned.

"The fire fight itself wasn't a big event," he said.

Investigators believe a light bulb broke above the court and heated a plastic tarp covering the disassembled wooden floor, last used for the NCAA Midwest regional in March.

Smoke and water damage were reported inside the storage room with minor damage to nearby meeting rooms.

Operation Manager Jim Mery said it was too early to see what kind of damage was done, "but if there's any damage, it's smoke."