Police have identified the man who they say entered a Midtown Manhattan office building wearing body armor and opened fire, killing four people with a high-powered rifle, as Shane Devon Tamura.

Four people were killed, including an off-duty New York City police officer, when a gunman opened fire in an office tower before fatally shooting himself, officials said.

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.