纽约大规模枪击事件致5人死亡，细节披露

Group 1 - The shooting incident occurred at 345 Park Avenue, the global headquarters of Blackstone Group, affecting multiple financial institutions located in the same building, including the NFL headquarters and KPMG [1][3] - The shooter, Shane Tamura, entered the building with an AR-15 rifle and began shooting, resulting in five deaths, including himself, and multiple injuries [4][12] - Following the incident, significant areas of Midtown Manhattan were closed, impacting firms such as Citadel and Jefferies, as the number of major financial companies in Park Avenue has surpassed those on Wall Street [3][12] Group 2 - Blackstone Group's office is expected to remain closed for at least a week, with the company's leadership expressing the event as "unimaginable" and the "worst day in the company's history" [12][13] - An NFL employee was among the injured, with the NFL president advising employees to work remotely and offering the option to take a day off [13] - The motive behind the attack remains unclear, with police investigating the shooter's background, which includes a history of mental health issues [13]