The NFL season kicked off at the annual Hall of Fame game with a moment of silence for the four people killed earlier this week by a shooter who was targeting league headquarters in New York. The gunman also wounded a league employee in the shooting Monday night.

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.

The NFL released a statement Wednesday expressing gratitude for a flood of support it received after its headquarters at a Midtown Manhattan high-rise was targeted in a mass shooting Monday evening.