Campaigners criticise police action at events to mark King Charles III's ascension to the throne.
Ruth Smeeth, chief executive of Index on Censorship, said the arrests were "deeply concerning", adding: "We must guard against this event being used, by accident or design, to erode in any way the freedom of expression that citizens of this country enjoy."
Jodie Beck, policy and campaigns officer at Liberty, said it was "very worrying to see the police enforcing their broad powers in such a heavy-handed and punitive way".Image caption,Also on Monday, a protester holding a sign reading "Not my King" outside parliament ahead of the King's arrival at Westminster Hall was ushered away by police.
Around 1,500 military personnel will work alongside police and civilian stewards to manage the huge numbers of people expected to flock to London over the next week.
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