As a large SUV rolled past a block of Austin's lively bars and late-night crowds in Sunday's early hours, a sweatshirted arm reached out the driver's side window with a pistol and began to pull the trigger.

Add Yahoo as a preferred source to see more of our stories on Google. The FBI's joint terrorism taskforce has been called in to help investigate a deadly mass shooting in downtown Austin, Texas, on Sunday morning in which a gunman opened fire in front of a bar popular with university students, killing two people and injuring 14 others before being fatally shot by police.