London riot police swoop on G8 protesters G8 protesters clash with police in London RAW VISION: Hundreds of protesters took to the streets of London under heavy police presence to demonstrate against the G8 summit, due to be held in Northern Ireland next week. London: Riot police have forced their way into a building in central London occupied by anti-capitalists, and clashed with protesters demonstrating in the British capital ahead of next week's G8 summit in Northern Ireland. Police said they had made six arrests, including one person accused of assaulting an officer and another for criminal damage. More than 100 riot officers surrounded a former police station in the Soho district thought to be an anti-capitalist squat, and after a tense stand-off pushed their way inside to escort several people from the building. A protester detained in London. Next week will see Enniskillen in Northern Ireland host the two day G8 summit where international leaders including Britain's Prime Minister David Cameron and US President Barack Obama take part in the two day event. Aerial television footage showed a protester being pinned down by officers on the roof of the building, where several police abseiling teams had positioned themselves. A banner reading "What if we smash the G8?" was hanging from a window. London's Metropolitan Police said they had "a search warrant relating to intelligence that individuals at the address were in possession of weapons and were intent on causing criminal damage and engaging in violent disorder." A protester is detained on Oxford Street in London as part of a protest ahead of next week's G8 summit in Northern Ireland. Officers removed large pieces of wood and metal poles from the building. The police operation came as around 150 protesters paraded through central London, banging drums in a "Carnival Against Capitalism" organised by the group Stop G8. Some 70 police in riot gear were deployed and there were several scuffles with demonstrators, an AFP photographer said. A spokeswoman for the Home Office, or interior ministry, said peaceful protest was "a vital part of a democratic society, providing it is conducted within the law." But she added: "Rights to peaceful protest do not extend to violent or threatening behaviour and the police have powers to deal with any such acts." Leaders of the world's richest economies including US and Russian presidents Barack Obama and Vladimir Putin are due to meet at Lough Erne in Northern Ireland on June 17-18.