Falcons wide receiver Drake London was penalized after catching a touchdown pass in the final minute of Atlanta’s 22-21 victory in Philadelphia on Monday night for pretending to shoot in the air, a violation of a longstanding NFL rule that prohibits violent gestures.

London immediately apologized on the sideline, according to Falcons coach Raheem Morris, and did it publicly on Wednesday.

“There’s a lot of stuff going around in the world with gun violence that I don’t think I should have displayed there,” London told reporters. “So, I’m not too happy with it, and (you) probably won’t see that again from me.”

The NFL has strict rules for celebrations and players are reminded annually that violations will result in unsportsmanlike penalties.

London’s 7-yard TD catch on a pass from Kirk Cousins tied the score at 21-21. His penalty pushed the extra point back 15 yards but Younghoe Koo made it from 48 yards out to give Atlanta a lead and Jessie Bates intercepted Jalen Hurts’ pass on the ensuing drive to seal the victory.

“We approach player celebrations as expressions of exuberance that are part of the excitement of the game. Rules were modified in 2017 that permitted group celebrations, including choregraphed demonstrations. Offensive demonstrations, celebrations that are prolonged and delay the game, and those directed at an opponent are still penalized,” NFL spokesman Brian McCarthy said in a statement. “Players are reminded annually and it’s part of the player manual that demonstrations that constitute taunting or unsportsmanlike conduct, or delays the game, will result in a foul against his team.

“Also prohibited acts that occur anywhere on the field or sideline include longtime prohibitions against throat slash; machine gun salute; sexually suggestive gestures; or stomping or demonstrations on a team logo.”

London’s celebration came 12 days after four people were killed in a shooting at Apalachee High School near Winder, Georgia. The Falcons hosted the school’s football team at their practice facility last week.