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.

Shane Devon Tamura, 27, identified by the NYPD as the Midtown Manhattan office building shooter/Obtained by ABC News(NEW YORK) -- The man who opened fire in a Midtown Manhattan office building, killin

A Nevada man recently traveled to New York City, entered a Manhattan building wearing body armor, carrying an M4 rifle, and fatally shot four people Monday evening, including a New York Police Department officer and injured another,