Video game maker Electronic Arts canceled three tournaments of its Madden NFL 19 football game to review safety protocols after a competitor who lost a tournament attacked with a gun, killing two gamers and wounding 11 others.

The murder-suicide occurred during a Madden NFL 19 video game tournament in a restaurant at Jackson's Landing, a waterfront retail and entertainment complex in downtown Jacksonville. 

The killings rocked the world of professional electronic gaming, also known as esports, which boasts an estimated 250 million players worldwide in a growing market worth about a billion dollars a year.