AUSTIN (KXAN) -- Traffic is currently shut down on MoPac Expressway in south Austin due to a crash, according to the Texas Department of Transportation. Around 2 p.m. Friday, TxDOT said all southbound lanes on MoPac at Barton Skyway are closed. It wasn't immediately clear what caused the crash or if there were any injuries. Drivers are urged to avoid the area or seek an alternate route. This is a developing story. Check back for updates.