Officials said the gunman fatally shot himself after his attack, which set off a chaotic scene that rippled out into the heart of Manhattan during rush hour.

Investigators are combing through evidence in the wake of New York City’s deadliest mass shooting since 2000, trying to figure out more about the gunman who unleashed an assault-style rifle in Midtown,

Midtown Manhattan was somber and on-edge after a mass shooting at an office tower left four people and the gunman dead, including Blackstone Inc. executive and a New York City police officer.