The gunman who killed four people, including an NYPD officer, inside a Manhattan office building Monday evening left a note and was apparently targeting NFL offices.

The owner of a private security business on Park Avenue said he questions how a shooter got so far into a Midtown office building.

The man who killed four people at a Manhattan office building bought his AR-15-style rifle and getaway car from his Las Vegas boss, NYPD officials said, as funerals for victims begin across New York.

In an exclusive report, a recent search of Shane Tamura's Las Vegas studio apartment, located just blocks from the Strip, has unveiled critical evidence linked to the tragic New York City shooting. SWAT teams were filmed by Channel 13 as they discovered a suicide note,