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Several suspects arrested in violent protests that erupted after the fatal stabbing of three children in northwest England were due in court on Friday as officials braced for more clashes that Prime Minister Keir Starmer condemned and blamed on "far-right hatred".
Starmer vowed to end the mayhem and said police across the UK would be given more resources to stop "a breakdown in law and order on our streets".
Demonstrations are being promoted online over the coming days in towns and cities including Sunderland, Belfast, Cardiff, Liverpool and Manchester, using phrases including "enough is enough", "save our kids" and "stop the boats".
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John Woodcock, the British government's adviser on political violence and disruption, said there was a "concerted and coordinated" attempt to spread the violence.
"Clearly, some of those far-right actors have got a taste for this and are trying to provoke similar in towns and cities across the UK," he told the BBC.
The attack on Monday on children at a Taylor Swift-themed summer holiday dance class shocked a country where knife crime is a long-standing and vexing problem, though mass stabbings are rare.
A 17-year-old, Axel Rudakubana, has been charged with murder over the attack that killed Alice Dasilva Aguiar, 9, Elsie Dot Stancombe, 7, and Bebe King, 6, in the seaside town of Southport in northwest England. He also has been charged with 10 counts of attempted murder for the eight children and two adults who were wounded.
A violent demonstration in Southport on Tuesday was followed by others around the country — fuelled in part by online misinformation that said the attacker was Muslim and an immigrant. Rudakubana was born in Britain to Rwandan parents and lived close to the scene of the attack.
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Suspects who are under 18 are usually not named in the UK, but judge Andrew Menary ordered that Rudakubana could be identified, in part to stop the spread of misinformation.
Far-right demonstrators have held several violent protests, ostensibly in response to the attack, clashing with police outside a mosque in Southport on Tuesday and hurling beer cans, bottles and flares near the prime minister's office in London the next day.
Merseyside Police, which is responsible for Southport, said it had made seven arrests so far and had a team of specialists reviewing hundreds of hours of footage to identify anyone involved.
"If you took part in this disorder, you can expect to receive a knock on your door by our officers," Detective Chief Inspector Tony Roberts said.
Police officers were pelted with bottles and eggs in the town of Hartlepool in northeast England, where a police car was set ablaze. Seven men aged 28 to 54 were charged with violent disorder and were due in court Friday, the local Cleveland Police force said.
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At a news conference Thursday, the prime minister said the street violence was "clearly driven by far-right hatred" as he announced a program enabling police to better share intelligence across agencies and move quickly to make arrests.
"This is coordinated; this is deliberate," Starmer said. "This is not a protest that has got out of hand. It is a group of individuals who are absolutely bent on violence."
Starmer said his so-called National Violent Disorder Program would enable police to move between communities — just as the "marauding mobs" do. Officers will harness facial recognition technology to identify culprits and use criminal behaviour orders often imposed on soccer hooligans that prevent them from going to certain places or associating with one another.
Starmer put some of the blame on social media companies, though he didn't announce any measures to address that and said there was a balance to be struck between the value they offer and the threat they can pose.
"Violent disorder, clearly whipped up online, that is also a crime. It's happening on your premises," he said.
