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The NFL is investigating whether players who competed in The Pro Football Arm Wrestling Championship at the MGM Grand casino in Las Vegas broke league rules, ESPN.com's David Purdum reported Sunday.
Former Seattle Seahawks running back Marshawn Lynch and Pittsburgh Steelers linebacker James Harrison were among those who competed in the event.
Purdum noted NFL players and officials are prohibited from appearing at casinos in a promotional capacity.
In 2015, the National Fantasy Football Convention, headlined by now-former Dallas Cowboys quarterback Tony Romo, was canceled over concerns about prospective punishments for players who took part in the event.