A man carrying a rifle killed four people at a New York City office tower Monday, including an off-duty New York City police officer, and wounded a fifth before taking his own life

Authorities confiscated several items from a Las Vegas apartment tied to a gunman who used an AR-15-style rifle to kill four people in Manhattan, according to records made public Friday.

Four people, including an off-duty New York City police officer, were killed Monday when a gunman carrying a rifle opened fire inside a Midtown Manhattan office tower, authorities said.