AUSTIN (KXAN) — A diesel fuel spill on the southbound upper deck of I-35 as well as the frontage road near downtown Austin slowed down traffic Thursday.

The Austin Fire Department warned drivers about backups, as crews respond to clean up the spill that’s affecting the upper portion of the interstate and the frontage road below. Firefighters reported this happening close to 4400 South I-35, which is located directly south of U.S. 290 in central Austin.

Firefighters said the fuel leak was stopped, but the frontage road and part of the upper deck closed for hours. AFD said its crews left the scene after the leaking fuel tank had been removed from the area.

The fire department asked people to watch for first responders working in that area.