Barriers were erected in front of the ritzy Midtown Manhattan office building where a crazed gunman killed four people Monday, with access being restricted even to some who work there.

Shane Tamura, the shooter behind the deadly rampage in Midtown Manhattan,​ was apparently targeting NFL offices, NYC Mayor Eric Adams says.

Follow along for live updates on the New York City shooting, where police investigate motive after five people, including the gunman, were killed in the Monday shooting.

The gunman had a ‘documented mental health history,’ but the motive is still unknown, police Commissioner Jessica Tisch said at a news conference.

The 27-year-old man who shot and killed four people at a Midtown office building on Monday carried a note in his pocket, police sources told ABC News.

A cross-country drive, a Midtown office rampage, and a note blaming football injuries. Here's what we know so far about the NYC shooter and his victims.

Louisiana Republican Senator John Kennedy advocates for ‘idiot control’ instead of gun control after a gunman killed four in a Manhattan skyscraper — a reaction that has infuriated some social media users.

Work was winding down at 345 Park Avenue on Monday when a man strode across the public plaza just outside the Midtown Manhattan tower with an assault rifle in his hand.