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.

The Nevada man behind a shooting spree in a Midtown Manhattan office building may have originally been targeting for the NFL headquarters, sources say. Police sources told ABC News Tuesday that a page of the note found in suspect Shane Tamura's pocket alleged the National Football League had concealed the dangers football contact could cause to players' brains to maximize earnings.

Police say the gunman in the Manhattan office building shooting tried to target NFL offices. In a note found in the gunman's pocket and obtained by CBS News, he alluded to having CTE. A former high school football player,