Gunman at video game tournament in Jacksonville kills 2 people, 11 others injured

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A mass shooting unfolded at a video game tournament in Jacksonville, Florida, on Sunday. Two people were killed and 11 others were injured before the gunman turned the gun on himself. Authorities identified the shooter as 24-year-old David Katz of Baltimore, Maryland. NBC’s Kerry Sanders reports. Please be aware, this video contains disturbing footage.