纽约发生枪击案，枪手曾是橄榄球运动员，有心理疾病史

Group 1 - A shooting incident occurred in a Manhattan building housing major companies including Blackstone Group and the NFL headquarters, resulting in four deaths including a police officer, with the shooter committing suicide [1][3] - The shooter, identified as Shane Tamura, was a 27-year-old man from Las Vegas with a history of mental illness, who opened fire in the building before taking the elevator to the 33rd floor [3][4] - The incident has raised concerns regarding the safety of corporate environments, particularly those associated with high-profile organizations like the NFL [1][4] Group 2 - The NFL has acknowledged the incident, with reports indicating that one employee was seriously injured but is currently in stable condition [4] - Investigations are ongoing to determine if the shooter specifically targeted the NFL headquarters, as he expressed grievances related to the organization in a note found on him [4]