MPs raise concerns after 52 people including anti-monarchists were detained over the course of the day.
Scotland Yard said those arrested had been held on suspicion of affray, public order offences, breach of the peace and conspiracy to cause a public nuisance around the coronation.
Shadow minister Jess Philips also used social media to say that "our nation and our King is not so fragile as to not be able to take harmless protest of a different view". Mr Smith confirmed he was released late on Saturday evening, adding that other members of Republic were still in custody."I have been told many times the monarch is there to defend our freedoms. Now our freedoms are under attack in his name."
The Met said it had confiscated "lock-on devices" - which protesters can use to secure themselves to things like railings.changes to the law that were passed this week.
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