The American Airlines Center has launched an investigation into four Dallas Stars fans doing what appears to be a Nazi salute during a December game. A 12-second video clip from Dallas' 5-1 win on Dec. 21 against the Toronto Maple Leafs shows Stars fans celebrating a goal with four of them appearing to raise and extend their right arms with a straightened right hand facing downward. Despite the game being played in December, the clip was amplified this week on numerous social media platforms. "American Airlines Arena (AAC) has zero tolerance for any acts of hate and/or discrimination, and we...