A 51-year-old man has been arrested in connection with an assault on a police medic during a Tommy Robinson rally at the weekend.
The medical officer was pulled to the ground and kicked in the head by a male on August 3, as supporters of the political activist campaigned for his release from prison on the streets of central London.
A counter-protest by groups including Stop Tommy Robinson and Stand up to Racism was held in the same location.
At around 1.20pm a group of protesters attempted to physically breach a police cordon, and it was during this incident that the police medic was assaulted.
On Tuesday evening, the man voluntarily attended a central London police station and was arrested on suspicion of actual bodily harm. He remains in police custody.
The Metropolitan Police released images of two men they wanted to speak to in connection with the incident yesterday, and said they are still seeking to identify a second man.
Superintendent Roy Smith, who policed Saturday's demonstration called the incident an attack "on the basic fabric of a civilised society".
"The sole purpose of deploying police medics to an event is to ensure the safety of those attending and provide care to those who require it," he said.
"I appeal to those involved, those who were with them on the day, or those who know who they are to do the right thing and come forward."
Robinson, 36, was handed a nine-month sentence at the Old Bailey last month - of which he will serve nine-and-a-half weeks - after he was found to have committed contempt of court.
He had filmed men accused of the sexual exploitation of young girls and live-streamed the footage on Facebook outside Leeds Crown Court in May 2018, in breach of a reporting ban.