Seven protesters have been injured and 26 arrested during the May Day demonstration in London, Scotland Yard have said.
Eight of those arrested are ‘‘foreign nationals’’, a police spokesman said.
After a five-minute stand-off hundreds of protesters stormed through the line of police in Holles Street.
Police were swept along by the force of the crowd for several hundred metres and were unable to cope with the mass of people.
Officers regrouped towards the far end of Holles Street but were surrounded by protesters on both sides.
Meanwhile police have closed Waterloo, Lambeth, Vauxhall and Hungerford bridges to pedestrians, Scotland Yard said.
And police on Regent Street launched another baton charge in new clashes with demonstrators.
Hundreds of protestors danced down Margaret Street into Cavendish Square.
There they reached an impasse when a line of police blocked the route into Holles Street.
The movement was monitored by two police helicopters as it came to a standstill in Cavendish Square.