Six people have been arrested after protests over BNP leader Nick Griffin's appearance on BBC Question Time.
A number of anti-fascist demonstrators earlier broke through a security cordon outside the BBC Television Centre in London.
Three police officers sustained injuries during the protest. All were treated at the scene.
Up to 1,000 people earlier clashed with police outside the BBC headquarters in London.
A BBC spokesman has said 'There are now approximately 200 protesters at TV Centre. Wood Lane has now been reopened to traffic.'
Earlier, 25 anti-fascist activists broke through police lines and briefly made it into the BBC building ahead of the far-right politician's arrival.
Mr Griffin entered the studio to muted applause where he shared the platform with Justice Secretary Jack Straw, Tory peer Baroness Warsi, Liberal Democrat home affairs spokesman Chris Huhne and writer Bonnie Greer.
A spokesman for BBC journalism said the programme had covered a 'wide range of issues', including race, freedom of speech, and whether Question Time had given the BNP 'an early Christmas present.'
'There were lively exchanges on topics such as whether the BNP had hijacked Churchill, on the panel's views of Islam and whether the rise of the BNP is the result of the Government's immigration policy.' the spokesman said.
The BNP has faced criticism for calling for an end to all immigration to Britain. It does not allow non-white members, although that is set to change after a recent court ruling
Demonstrators outside the television centre were said to be saying 'We're black, white, Asian and Jew, BBC shame on you', and 'we won't let Nick Griffin through'.
In Belfast, around 100 anti-racism protestors gathered outside the BBC on Ormeau Avenue.
There were also reports of a smaller protest in Derry.