The attack is related to an ongoing sex-grooming trial.
A mob of about 200 people has attacked Asian takeaways in Rochdale in apparent race-related violence.
Windows were broken, police officers pelted with bricks and several vehicles damaged in the violence on Thursday night after the group gathered in the Heywood area of the city. One officer suffered bruising.
Police in riot vans filled the area and eventually dispersed the crowd, arresting a 35-year-old man and a 14-year-old boy.