At least three people, including a child, are dead after a gunman opened fire in a Target parking lot in Austin, Texas, before stealing two cars and being tasered by police, authorities said.

Officers found the alleged shooter walking naked after he ditched his clothes in a portable toilet, police said.

A gunman opened fire Monday in a Target store parking lot in the Texas capital, killing at least three people, then stole two cars during a getaway that ended with police using a Taser to detain him on the other side of the city, authorities said. Austin Police Chief Lisa Davis said the suspect is a man in his 30s with "a mental health history."