Firefighters were called out just before 2:30 p.m. today to battle a brush fire on South Mopac (Loop 1) near the Capital of Texas Highway (Loop 360) exit. The fire was controlled about 2:45 p.m. But Austin Police have temporarily closed the southbound onramp to Mopac from Barton Skyway because of the smoke put off by the fire. The onramp is expected to reopen after 3:30 p.m.