Sheffield United's board have criticised fans involved in trouble that arose during their 1-0 loss at home to Norwich this weekend.
A statement from the 'Blades' board revealed that incidents during and in the aftermath of the game had resulted in supporters being injured, objects being thrown on the pitch and "high-profile Norwich officials threatened and abused".
The club could be in line for sanctions, including financial penalties, and have been reported to the Football Association.