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By Jasmine Andersson
BBC News
A controversial new law under which six anti-monarchy protesters were arrested on Coronation day has been criticised as too crude and too broad.
Ex-Greater Manchester police chief Sir Peter Fahy said "poor police officers" were left to interpret the law "passed only a few days" before the Coronation.
Conservative MP David Davis has called for the law to be scrutinised by the Home Affairs Select Committee.
But the government said it is "the right legislation."
Graham Smith, chief executive of anti-monarchy group Republic, was one of those arrested and said he will take legal action against the Metropolitan Police after he was arrested and released without charge by police after changes to the Public Order Act.
Protesters were arrested after police found items they suspected would be used as "lock on" devices.
But the force later expressed "regret" after finding no proof of finding intent to use the items in this way and Mr Smith said he had received a personal apology.
Former Greater Manchester police chief Sir Peter said he gave evidence in Parliament expressing his concern that the new law was "poorly defined and far too broad".
He told BBC Radio 4's Today programme: "We see the consequences of that, particularly for the poor police officers who have to make sense of legislation that was only passed a few days ago.
"This law could affect all sorts of protests in your local community, and this legislation could be used against you, and the police would be under pressure.
"The government have actually reduced the amount of discretion the police have in getting the balance right."
Former cabinet minister David Davis was the only Conservative MP to vote against the changes to the Public Order Bill.
He told the Today programme: "There's too many elements of the law that are too crude and too broadly defined.
"What the government said was that it expects the police to come up with standards of behaviour. That's very woolly. If we're going to do that, we should do it properly, do it centrally, with the same level of democracy in the whole country.
"No-one wants a day ruined, but the right to put up placards is virtually absolute in British democracy."
'It must be balanced'
London Mayor Sadiq Khan has requested "further clarity" from Scotland Yard, saying that the right to peaceful protest is an integral part of democracy.
He tweeted: "While it's vital the police are able to keep us safe, it must be balanced with protecting the right to peaceful protest - an integral part of democracy.
"Londoners will want swift reassurance any lessons to be learned will be learned."
Shadow housing minister Lisa Nandy said "clearly something has gone wrong" in the handling of Mr Smith's case, and expressed her support for a review into the matter, which has been requested by the Mayor of London, Sadiq Khan.
However, she said Labour was not committing to "wholesale repeal" of the new law, which has been criticised for clamping down on the rights of peaceful protesters.
She told BBC Breakfast: "One of the questions we have is 'why was it that this group were clearly in contact with the Met, had informed them about their plans, and yet still ended up arrested up and prevented from protesting?'.
"If there is a problem with the legislation, of course we'll rectify that in government, but we're not into wholesale repeal of legislation without understanding what the actual problem is first."
'Right legislation'
But government minister Neil O'Brien said that "overall in a difficult situation" the police had handled the weekend's events well.Mr O'Brien said the Public Order Act was "the right legislation", and was needed to target a "tiny and very selfish minority" who were "out to cause chaos"."We've got the balance right," he insisted.He said the Met was right to apologise if mistakes were made.
On Monday, Rishi Sunak said he was "grateful to the police" for ensuring that the Coronation weekend had "gone so well, so successfully, and so safely."
"The police are operationally independent of government, they'll make these decisions based on what they think is best," he told broadcasters at a Big Help Out volunteering event in Hertfordshire.