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The NFL has increased security at its offices after a lone gunman opened fire at the league's headquarters in New York City last month, killing four people and injuring one league employee.

NFL Executive Vice President Jeff Miller confirmed the new security measures to OutKick, adding that the league is "working with the building and tenants within the building on building security."

"We're very lucky that our security chief, Cathy Lanier, the former police chief in Washington, D.C., has tremendous experience in this space and that we have terrific partners in the building as we look for ways to make it even more secure than it was before."

Four people were killed, and a fifth was wounded inside the 345 Park Avenue

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