Texas, March 1 -- At least three people were killed and 14 others were injured after a mass shooting at a popular bar in Austin, Texas, authorities confirmed on Sunday. The gunman was also killed in an exchange of fire with police.

The Federal Bureau of Investigation (FBI) Joint Terrorism Task Force has joined the investigation into the mass shooting. According to officials, there were indicators on the suspect and in his vehicle suggesting a "potential nexus to terrorism," though investigators cautioned that it remains too early to determine the motive, CBS News reported.

FBI Acting Special Agent Alex Doran said during a Sunday briefing that authorities are probing all possible angles, including whether the suspect may have self-radica...