Pittsburgh Steelers tight ends coach James Daniel is under investigation by NFL security for allegedly assaulting a New England Patriots fan Thursday night, according to a report by ESPN.

The incident occurred at halftime of the Patriots' season-opening victory over Pittsburgh. Daniel was en route to the Steelers locker room when he was seen kicking the fan in the leg and yelling at him in front of witnesses, the report said.

NFL security, which reportedly did not witness the incident, and police were waiting for Daniel when he returned to the coaches booth for the start of the second half. Daniel also shouted at a police officer, according to the report, and was later interviewed by NFL security.

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A league spokesman confirmed that the NFL is looking into the alleged incident involving Daniel, who is in his 12th season with the Steelers.

(h/t ESPN)