Firefighters Battle 50-Acre Brush Fire Near Onion Creek And I-35

Update at 12:28 p.m. Sunday: The Austin Fire Department tweeted that the brush fire was 90% contained. Crews were continuing to monitor the scene.

Our original post:

The Austin Fire Department said a brush fire along Onion Creek in southern Travis County burned 50 acres and was 40% contained around 7:45 p.m. Residents near Old San Antonio and Onion Creek Parkway were told to stay alert, but no evacuations had been ordered. No injuries have been reported.

AFD said the fire was caused by "sparks from contractors grinding on metal fence post." The department said crews would remain on scene overnight to monitor for flareups.

It tweeted maps of the burned area.

Manchaca, Buda, Austin, Travis County and Westlake fire units responded to the second-alarm fire. Star Flight and the Texas Forest Service were assisting.

Austin officials tweeted that they had received multiple calls for reports of smoke from the fire. They asked people to refrain from calling 911 unless they see fire or smell smoke indoors.

Travis County is under a burn ban right now, amidst very dry conditions.

This story is developing.