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Dean Ambrose, one of the giants in the WWE, was almost attacked during a taping of Smackdown ... attacked by a guy some say was holding a sharp object which at least one fan says was a knife.

It happened right after the show in Providence. You see the would-be attacker come right for Ambrose, but a quick-thinking security uses a wrestling move of his own, body slamming him to the ground.

It's unclear what happened to the guy or what if anything he was clutching.