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According to eyewitness accounts and reports from news outlets such as NBC and CNN, the gunman moved through the open plaza before entering the building. An NYPD officer, who was working security on-site, was struck during the chaos. Remarkably, it is believed that the shooter acted alone and eventually died from a self-inflicted gunshot wound, bringing an end to the immediate threat.
During the incident, the gunman managed to traverse the building, going through cubicles and shooting several workers along the way. Witnesses recounted seeing the suspect—carrying a long rifle—walking into the area with apparent intent and no apparent resistance at entry. Responding police quickly cordoned off the surrounding streets and initiated thorough searches to ensure no additional danger remained.