London ( CNN ) -- At least 57 people were arrested in London on Tuesday in connection with plans for anti-capitalist demonstrations before next week 's Group of Eight summit , police in Britain said . Those arrested were accused of possession of weapons with the intent to cause violent disorder , possession of pointed/bladed articles and a variety of public order offenses . Earlier , police in riot gear raided a building in central London . Britain is hosting the G8 world leaders at a summit next week in Northern Ireland . A `` Carnival Against Capitalism '' has been planned by demonstrators ahead of the summit . Demonstrators long have targeted the G8 summit to protest the economic policies of the world 's leading industrial powers . The group is made up of Canada , France , Germany , Italy , Japan , Russia , the United Kingdom and the United States . The Carnival Against Capitalism group said it has n't negotiated with police and stressed that it wo n't be controlled . It planned a `` mass action '' of protests for central London on Tuesday afternoon . `` London is right at the heart of global capitalism , '' the Carnival group said on its website . `` The powerful feel safe in London so long as they go unchallenged . '' `` Traditionally , carnival is the time where the people take over the streets , the bosses run and hide , and the world gets turned upside down . It is a time to celebrate our resistance and our dreams , to bring music and colour to the streets . And also to show our strength and our anger . '' The group said in a statement that the mass actions `` will only be as effective as the people participating in them . '' `` We have not negotiated with the police and we will not be controlled . If we look after each other , stay mobile , do n't get caught in kettles and are ready to make quick decisions about what to do next , we can make the most of the day . See you on the streets , '' the group said . The London Metropolitan Police says it has `` an appropriate police plan in place . '' There were nearly 1,200 officers on duty as part of Tuesday 's policing operation around the G8 summit .
People accused of having weapons with a violent intent are among those arrested . Police say they have a plan to deal with the protests . ` ` London is right at the heart of global capitalism , '' Carnival Against Capitalism group says . The G8 is set to meet next week in Northern Ireland .