MANHATTAN, New York (WABC) -- The NFL is increasing security at its headquarters after last month's mass shooting in Midtown Manhattan.

A league executive says the NFL is working with the other tenants at 345 Park Avenue to make it happen. The building reopened August 4.

Earlier this month, the NFL recommended enhanced security measures at team and league facilities. Proposed changes will be reviewed at a special league meeting next week.

Investigators believe the gunman was targeting league offices when he shot and killed four people , before turning the gun on himself.

Mayor Eric Adams honored the family of one of the victims, Aland Etienne, Thursday night.

Etienne worked as a security guard at the building.

The mayor invited his family to Gracie Mansion for a Haitian herita

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