The man who opened fire in a Midtown Manhattan office building, killing four people and wounding a fifth, appeared to be targeting the NFL headquarters and had a note claiming he suffered from CTE, police sources told ABC News.

No motive has been announced. A suicide note was found expressing grievances with the NFL and saying Tamura suffered from CTE, a source said. Follow for live updates.

The alleged gunman at a shooting rampage in a midtown Manhattan office building was identified as 27-year-old Shane Tamura, of Nevada.

Multiple casualties as gunman opened fire in the lobby of the midtown Manhattan building on Park Avenue that is home to the Blackstone investment firm and other corporations before moving to other floors.

NYC Mayor Eric Adams shared new details about the deadly Midtown Manhattan office shooting, including a possible NFL connection and the gunman's cross-country journey.

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

Ivory Bridgewater faces one count of first-degree assault after allegedly shooting his ex-girlfriend’s friend in a bar parking lot.

Three men who were involved in a shooting on the top floor of a parking garage near Fort Lauderdale beach last month that injured three people were recorded on surveillance video but have not yet

Baltimore Ravens head coach John Harbaugh commented on the shooting that killed four people inside a New York City building that houses the NFL headquarters.