Ugly scenes are unfolding outside of the Old Bailey as crowds gather for Tommy Robinson's sentencing.
Supporters have been seen pushing police officers and letting off smoke bombs.
The far-right extremist, 36, whose real name is Stephen Yaxley-Lennon, was found guilty of contempt of court last week.
A judge has retired this morning to consider his sentence.
This morning, he arrived late to court where hundreds of supporters had gathered to see him, wearing a shirt that read: ‘Convicted of journalism’.
Richard Furlong, representing Robinson, had to apologise for the 36-year-old's late arrival.
One of the judges replied: "It's not a very good start."
As crowds gather outside the court ahead of his sentencing, supporters can be seen pushing police officers and each other.
Around 200 supporters have gathered at a double-decker bus which is blocking the street and a stage has been erected, with speakers - including former UKIP leader Gerard Batten - addressing the crowd.
Smoke bombs have also been let off as tensions flare.
One supporter can be seen with a placard that says: "The Nazis blindly followed orders. Will police do the same?"
The court previously heard how Robinson was "subjectively reckless" by breaching a reporting ban barring publication of details about the case.
The extremist, whose real name is Stephen Yaxley-Lennon, filmed defendants in the trial and broadcast it on Facebook in May last year.
He denied encouraging violence against defendants in the grooming trial when he gave evidence during contempt of court proceedings but he was convicted last week.
Protesters who disagree with Robinson's views have also gathered outside the building.
On Tuesday, the High Court gave its reasons for finding Robinson in contempt of court, stating that he encouraged “vigilante action” against the defendants when he filmed them and broadcast the footage live on Facebook.
Dame Victoria Sharp and Mr Justice Warby found the 36-year-old was in contempt in three respects when he filmed men accused of the sexual exploitation of young girls and live-streamed the footage, in breach of a reporting ban, outside Leeds Crown Court in May 2018.
