The incident began at approximately 6:30 PM ET when Tamura entered the 345 Park Avenue building, which houses notable companies, including the NFL. Witnesses reported scenes of panic as people fled to safety or sheltered in offices. Upon entering, Tamura immediately targeted Officer Islam, who was a security official at the building, shooting him in the lobby before the rampage continued through the premises.

NYPD Commissioner Jessica Tisch noted that Tamura had a documented mental health history and had made a cross-country trip in the days leading up to the attack, stopping in various states before reaching New York. His ties to the city and the specific building remain unclear. Following the rampage, police discovered multiple magazine rounds and a revolver inside the suspect's vehicle parked nearby.

Officer Islam, described as a hero, had served in the NYPD for three years and leaves behind a pregnant wife and two children. Political and public figures expressed their condolences, praising his dedication and service. Emergency responders worked for hours to secure the building and evacuate frightened employees, highlighting the ongoing concerns surrounding gun violence in the United States.

As the investigation unfolds, the local community mourns the loss of both innocent victims and a brave officer who made the ultimate sacrifice in the line of duty.