The NFL is recommending implementation of "enhanced security measures" at all team and league facilities, according to a memo obtained by ESPN on Friday, following the shooting last week at the midtown Manhattan building that houses NFL headquarters.

The memo, which was sent by the NFL's chief security officer and general counsel to all team owners and presidents following a meeting of the league's security and conduct committee, recommended three protocols: updated threat assessments to correctly mitigate and identify risks; armed law enforcement or security officers at team and league facilities whenever players or staff are present; and weapons screening in order to enter team and league facilities - similar to what one would go through on a game day.

"The Committee recognizes that

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