Protestors clash with supporters of Austrian leader of far-right anti-immigration group as he vows to speak in Hyde Park

• Right-wing activist Martin Sellner said he would appear at Speakers' Corner
• It came after Mr Sellner cancelled a planned address to the youth wing of UKIP
• Today his supporters clashed with anti-fascist protesters in London's Hyde Park 

Demonstrators have taken to London's Hyde Park after far-right Austrian activist Martin Sellner said he was planning to speak there on Sunday.

Mr Sellner said that 'security risks' and 'left wing threats' had forced him to cancel an earlier planned event with UKIP's youth wing Young Independence.

He later tweeted that he would appear at Speakers' Corner in London's Hyde Park on Sunday, although his anti-immigration group claimed he had been detained at the border. 

Pictures today showed demonstrators turning out on both sides as supporters of Mr Sellner clashed with anti-fascist protesters.  

The Austrian activist is a member of the anti-immigration group Generation Identity.

'This massive immigration is changing the face of our streets, of our cities, and soon the people who have been living here for thousands of years will be an endangered minority,' Sellner said last year. 

He tweeted last Tuesday: 'My speech for the Young Independence conference was cancelled for the 2nd time, due to security risks caused by left wing threats.

'But we won't be silenced. On Sunday the 11th I will give my speech on Speakers' Corner and I invite everybody who had a ticket for the conference to come!'   

The Generation Identity Facebook page claimed that Mr Sellner had been denied entry at the border. 

It is also alleged that his girlfriend Brittany Pettibone, a fellow right-wing activist, was not allowed to enter the country.  

But Home Office spokesman said the department would not comment on whether Mr Sellner or his girlfriend had been detained, the Evening Standard reports. 

Hope Not Hate said Generation Identity had been handing out leaflets near Hyde Park before the planned speech.