Detectives have released images of 10 people suspected of "serious disorder" at a 'Free Tommy Robinson' rally that left over 20 police officers injured.
Pieces of scaffolding, barriers and glass bottles were thrown at Metropolitan Police when disorder broke out at the demonstration on June 9, 2018.
The force are now appealing for information on the individuals pictured, who are wanted in connection with the disruption.
Detective Sergeant Matt Hearing said: "We are extremely keen to identify these individuals, who were involved in serious disorder which resulted in a number of police officers getting injured.
"Whilst we will always facilitate lawful protest, the actions of some individuals on that day showed a total disregard for the law and it is important that all those involved are brought to justice."
The demonstration was held in London's Trafalgar Square as Robinson, a former UKIP adviser, served his first sentence for contempt of court.
He had been jailed for sharing footage on Facebook that showed defendants in a sexual exploitation trial, putting the case at risk of collapse.
The English Defence League founder was jailed again this year for the same offence, and served nine weeks of a nine-month sentence.
He claimed to have received 14 sacks of mail from supporters while in prison.
Anyone with information about the 10 individuals pictured can call the Met's Public Order crime team on 020 8246 0076 or Crimestoppers to remain anonymous on 0800 555111.