One of the dead was the shooter, the source said, adding there was no apparent link to terrorism.
A white tarp covered what was believed to be a body in front of the entrance to the office building but police declined to confirm if it was the shooter.
“I heard the gunshots,” said Dahlia Anister, 33, who works at an office near the 102-story Empire State Building. “It was like pop, pop, pop. It was definitely in a bunch.”