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12 August 2011, 10:23 | Updated: 12 August 2011, 18:14
Officers have arrested a 17-year-old boy on Friday on suspicion of violent disorder, in connection with the disturbance in Cambridge on Tuesday night.
It follows the arrest of eight people on Thursday.
Officers were called to reports of between 30 and 40 youths, some wearing face coverings, hanging around Midsummer Common at 11.35pm on Tuesday. The group made their way towards the Grafton Centre and some threw items, including rubbish, at officers.
Two officers suffered minor injuries.
Now police have released the images of two people they want to speak to in connection with the incident.
Detective Sergeant Emma Compson said: "We are keen to hear from anyone who recognises these people.
"I would also urge the people who are pictured to contact police themselves.”
Anyone with any information should call DS Compson on 0345 456 456 4 or Crimestoppers, anonymously, on 0800 555111.