New York City mayor says gunman was focused on the NFL's Manhattan offices

Incident Overview - A shooting occurred at an office building in Manhattan [2] - The suspect, identified as 27-year-old Shane Tamura, allegedly used an M4 assault-style rifle [3] - The suspect died from a self-inflicted gunshot wound to the chest [3] - Four victims were involved, including a police officer, a Blackstone executive, and security personnel [1] Suspect and Motive - The suspect may have been targeting the NFL [4] - Authorities in Las Vegas indicated the suspect had mental health issues [4] - A note found in the suspect's wallet mentioned CTE as a potential cause of his mental illness [4] - The suspect reportedly claimed in the note that the NFL knowingly concealed dangers to the brain to maximize profits [5] - The suspect was not an NFL player but may have been focused on an NFL agency located in the building [5] NFL Response - NFL Commissioner Roger Goodell issued a statement to employees, expressing grief and support [6]