Updated at 9:19 p.m. ET Sunday
A 24-year-old male opened fire during a video game tournament at a mall in Jacksonville, Fla., on Sunday afternoon, killing three people, including himself, according to the local sheriff.
Sheriff Mike Williams says the suspect has been identified as David Katz from Baltimore. The gunman used at least one handgun and was a participant in the tournament, according to the sheriff. Authorities planned to release more information about the suspect later on Sunday.