Two people were arrested and 10 others dealt with by police as hundreds took part in an anti-lockdown demonstration in Liverpool.
More could also face action after the protest march through the city centre by a crowd questioning restrictions designed to limit the spread of coronavirus.
Merseyside Police had warned public gatherings would be deemed as posing a health risk and that officers would step in if necessary.
Between three hundred and four hundred people took part in the demonstration this afternoon, marching through the city centre from around 1pm.
Images showed protesters holding signs including "You can censor us but you will not silence us" and "Wizards vs Lizards".
The scenes unfolded as, elsewhere in the city, queues formed at new testing sites established in Liverpool as part of a major testing programme supported by public health officials.
Less than 24 hours before the anti-lockdown protest, Merseyside Police had warned it would "take action against any individuals, or businesses, who fail to adhere to the current restrictions and are putting other people at risk".
At midday, the force then introduced a dispersal zone covering much of the city centre.
The tactic, typically used to counter anti-social behaviour, meant anyone asked to leave an area which included the Baltic Triangle, Liverpool ONE and the waterfront could be arrested if they returned before midnight.
Today, a large police presence could be seen in the city centre ahead of what was the latest demonstration against lockdown measures.
And while the scenes appeared peaceful, police have tonight confirmed they did take action against a small number of those involved - adding that more could also face scrutiny as enquiries continue.
Seven people were issued with dispersal notices and three others, who were said to be in breach of coronavirus legislation, were issued with fixed penalty notices.
Officers also arrested a 23-year-old man from Wirral who was wanted by police and a 37-year-old man from Anfield on suspicion of assaulting a police officer.
They were both taken to a police station for questioning.
This evening, Chief Superintendent Paul White said: “ Merseyside Police has made it very clear on numerous occasions that public gatherings, including protests, are not allowed under the latest coronavirus legislation as they present a real risk to public health.
“A significant amount of people turned up in Liverpool city centre this afternoon and showed complete disregard for the legislation which has been put in place for four weeks to protect our communities.
“Two people were arrested during the protest and officers issued three fines under the coronavirus legislation along with seven anti-social behaviour dispersal notices.
"We are now gathering evidence and carrying out a number of enquiries to identify those who attended, in particular those involved in organising the event, so that further enforcement action can be taken."
*Anyone with information is asked to contact Merseyside Police on Twitter (via @MerPolCC), or by calling 101 quoting the reference 268 of November 7. You can also contact Crimestoppers, anonymously on 0800 555 111
