There was a fast spreading grassfire on Highway 44, between FM 24 and FM 1694, in Annaville Monday morning.
The small fire was first spotted by a passing Border Patrol unit around 10 a.m. The agents called the fire department, and in the meantime tried to stomp out the fire, but that didn't work.
The fire spread to two separate fires in a matter of seconds.
"It spread very quickly," said Michael Clack, chief of the Annaville Fire Department. "Conditions are optimal for fires right now. Humidity has fallen. Wind has picked up. Everyone needs to be careful out there."
The Annaville and Robstown fire departments were able to put out the fire within 15 minutes. Fire crews believe the blaze was sparked by a passing 18-wheeler with a faulty brake system.