In a video TMZ Sports obtained, Elliott can be seen arguing with a woman identified as his girlfriend. While their altercation doesn't become physical, Elliott then gets into a security guard's face and uses his forearm to push him into a metal gate (starts at 1:10 mark).
Elliott was detained but not charged for the incident.
"Security misconstrued and overreacted to the situation," Elliott's attorney, Frank Salzano, told TMZ Sports.
"He was cuffed as a precautionary measure," Salzano said. "He was released with no charges. He left Vegas that night and went to his (youth football camp in Dallas) on Sunday."
Elliott was suspended for six games in 2017 after an NFL investigation into an incident with his ex-girlfriend. The Pro Bowler wasn't charged with any criminal offenses, but the league doesn't require any to enforce its own punishment.
Cowboys chief operating officer Stephen Jones said the team is gathering information about the incident, according to David Helman of DallasCowboys.com.