Multiple people have been shot and killed at a New York City office building where the NFL is headquartered, according to NYC Mayor Eric Adams.

NFL employees were told to shelter in place Monday evening as a gunman opened fire inside the New York City building that houses the league's headquarters, killing four and leaving another in critical condition.

At least two reported shot after gunman entered New York Midtown building where Blackstone and NFL based - Large numbers of police seen outside Manhattan skyscraper