UPDATE: After fire crews said the prescribed burn-turned brush fire was 90 percent contained Wednesday, officials said Thursday morning the fire picked up again. They are asking residents to avoid the area of FM 967 due to emergency vehicles and "air resource activity."

Shortly after 1 p.m., officials said the fire "is considered contained right now." Some areas are still being extinguished.

ORIGINAL STORY: A prescribed burn turned into a brush fire, expanding 50 acres outside of its controlled area, Austin Fire officials said Wednesday.

According to the Austin Fire Department, the fire began getting out of control around 3 p.m. near the 6500 block of FM 967 on a property owned by Austin Water Utility. According to KVUE's Tina Shively, a cedar tree near the fire line torched by the prescribed burn spread embers and caused extra flames to escape. This caused an additional 200 acres to burn.

Officials said no structures have been damaged or injuries reported, as of 4:19 p.m. Wednesday.

At around 6:42 p.m., AFD said the fire was 90 percent contained as multiple crews from surrounding cities work to extinguish the blaze. Those include Oak Hill Fire, Kyle Fire, Manchaca Fire, and the Buda Fire Department.

STAR Flight and the Austin Police helicopter are currently dropping water on the fire.

This is a developing news story. This page will update as more information becomes available.