There were 23 shell casings and 13 bullet fragments recovered from the lobby of 345 Park Avenue and 24 spent shell casings on the 33rd floor, police said.

A man stalked through a Manhattan office tower firing a rifle, killing four people, including a New York City police officer, and wounding a fifth before taking his own life, officials said.

Fear and confusion were rampant after a gunman shot and killed four people and wounded another in a Midtown Manhattan office tower Monday evening before, authorities said, taking his own life.