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Police investigating the attack on Canning Circus police station are trying to find a number of witnesses who were in the area at the time.
Canning Circus was one of five police stations targeted during the street violence on Tuesday 9 August 2011.
A window was smashed and there was minor smoke damage to the building, but no one was injured.
Fifteen people have already been charged with arson with intent and violent disorder in connection with the incident.
But officers investigating the incident believe people in the area at the time may have vital information that could assist the inquiry as up to 40 people are thought to have been involved in the attack.
Among the people officers would like to speak to are:
* The driver of a car, possible a private hire taxi, whose vehicle was set upon by some of the group.
* The driver of a vehicle that was struck by a homemade petrol bomb as the station was attacked.
* The drivers of several vehicles in Derby Road and around Canning Circus island who had to take evasive action to avoid the violence.
* Members of the public in Alfreton Road who gave directions to passing police vehicles as they responded to the incident.
Detective Sergeant Michael Allen, who is investigating the attack, said: "People may not think that what they saw is important, but the information they hold could be vital to the inquiry.
"Many of the offenders had their faces covered at the time so descriptions of clothing worn by the group could assist the investigation greatly.
"I'd like to thank the members of the public who have already contacted us with information about the disorder. It is a long and complex investigation and it will take some time to make contact with each and every one of those people."
To date, 125 people have been arrested and 74 people charged in connection with the violent disorder that happened in the city over three days.
Witnesses or anyone with information about the violent disorder is asked to call the investigating team on 0300 300 9999 extension 8024683 or Crimestoppers anonymously on 0800 555 111.