The Occupy London movement has claimed that 20 protesters involved in a cycle demonstration yesterday were held on a bus overnight without arrest.
Under the Police and Criminal Evidence Act (PACE), a member of the public in police custody is entitled to a phone call and to talk to a lawyer. Occupy claims the group was denied these rights.
Police confirmed that more than 100 people were arrested last night but have not commented on claims that a group were held without arrest on a bus.
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Police said 375 people attended a rally in Newcastle by the anti-Islam group Pegida, while 2000 people joined a counter-demonstration.