The United States' war on Iran is being looked at by authorities as the potential motivation for a mass shooting outside a bar in the Texas capital.

Police in Austin shot and killed the gunman, who used both a pistol and a rifle to carry out the attack, police said.

The shooting happened outside Buford’s Backyard Beer Garden just before 2 a.m. along Sixth Street, a nightlife destination filled with bars and music clubs and only a few miles…