The NFL vowed to be resilient, two days after league headquarters was targeted by a gunman who killed four people on Monday.

New York City mayor Eric Adams said Tuesday that the 27-year-old gunman who killed four people and injured another in a shooting at 345 Park Avenue on Monday was trying to target the NFL's headquarters, which are located in that building, but inadvertently took the wrong elevator.

A fifth shooting victim -- an NFL employee, according to Commissioner Roger Goodell -- was injured and taken to the hospital in critical condition, officials said. That victim was listed in stable condition on Tuesday morning, according to a source familiar with the individual's status.