A participant in a video game tournament in Jacksonville, Florida, has shot dead two people before killing himself, police say.
They named the killer as David Katz, 24, from Baltimore and say he used one hand gun. No other suspects are sought.
Eleven other people were injured on Sunday at Jacksonville Landing, a large shopping and entertainment complex.
Some unconfirmed reports say Katz had become angry after losing at the American football eSports event.
The victims are not being officially named until their next-of-kin are informed, although tributes to two gamers have started appearing on social media.
Florida has seen several mass shootings in recent years, including at the Pulse nightclub in Orlando in 2016, when 49 people died, and the Marjory Stoneman Douglas School in Parkland in February this year, when 17 people were killed.