The NFL is investigating an allegation that a Steelers assistant coach assaulted a Patriots fan at halftime of Thursday night’s game.

Adam Schefter of ESPN reports that the NFL’s security department is investigating Steelers tight ends coach James Daniel for “allegedly assaulting and verbally accosting” a fan while Daniel was on his way to the Steelers’ locker room. A Steelers spokesman said the team is also investigating the accusation.

The allegation says that Daniel kicked the fan in the back of the leg and yelled at him. There were witnesses, according to the report. The report also says that Daniel was approached by police about the matter, and that Daniel then began shouting at a police officer.

The 62-year-old Daniel is in his 12th season on the Steelers’ staff and has more than 20 years of NFL coaching experience, having also spent time with the Giants and Falcons.