London - Police arrested four people during a raid on an anti-capitalist group who were expected to lead protests against a government-backed arms fair.
Two men and two women were held on suspicion of conspiracy to cause violent disorder after detectives swooped on the south London base of Disarm DSEi, which has links with the direct action group Reclaim the Streets.
The four were later released on bail.
Hundreds of people are expected to take part in demonstrations against the Defence Systems and Equipment International Exhibition, which starts today.