Officials say a man with a rifle killed an off-duty New York City police officer and three other people before taking his own life at a Manhattan office tower. New York City Mayor Eric Adams said Tuesday that the gunman was trying to target the headquarters of the National Football League on Monday but took the wrong elevator. The city recently announced it was on pace to have its fewest murders and fewest people hurt by gunfire of any year in recent decades. Police say the gunman had a history of mental illness. A rambling note found on his body suggested he had a grievance against the NFL.