The NFL has increased security at its offices following a shooting last month at a Manhattan building by a gunman authorities say was targeting league headquarters .

“We are working with the building and the other tenants within the building on building security,” NFL executive Jeff Miller said Thursday.

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The league previously recommended enhanced security measures at team and league facilities. The recommendations will be reviewed at a special league meeting on Aug. 26.

NFL employees are back in their offices after working remotely in the weeks following the shooting that killed four people and injured a league employee.

Investigators believe Shane Tamura, 27, of Las Vegas, was trying to get to the NFL o

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