Violent thugs who went on the rampage in towns and cities in Britain were warned on Monday they face being locked up within days rather than heading off on summer holidays.
Home Secretary Yvette Cooper stressed that police were getting the full backing of the Government to crack down on the violent protests.
She slammed the “disgraceful scenes of criminal violence and thuggery”.
Vowing to deliver “swift justice” for the “unacceptable disorder”, she emphasised that there would be a “reckoning” for the offenders, including “serious prison sentences” for the worst culprits.
“We simply can’t stand for this,” she told Sky News.
“So we should be clear there will be people who were thinking they were going on their summer holidays this week and instead they will face a knock on the door from the police, they will face arrest, and a police cell while they wait for trail in order to make sure that they do pay the price for what they have done.”
Hundreds of people have already been arrested.
“We have made very clear to the police they have our full support in pursuing the full range of prosecutions and penalties including serious prison sentences, long term tagging travel bans and more,” Ms Cooper added.
The full range of offenders would face justice, she added, from individuals who turned up at last minute and took part in looting to those who engaged in “really dangerous arson, damage and criminal violence.
Sir Keir Starmer is expected to hold a Cobra emergency response meeting on Monday morning after far-right thugs tried to storm hotels housing asylum seekers on the sixth day of escalating disorder.
Monday’s meeting is due to involve relevant ministers and police representatives who will discuss the response in the coming days to ensure there is no repeat of the violent scenes.
But shadow home secretary James Cleverly said the Government "should have been quicker" in its response to riots taking place in England, and to holding a Cobra meeting.
He told Sky News: "These are the actions of people who are clearly responding to disinformation online, but are obviously motivated by racism. We've seen people with swastika tattoos and giving the Nazi salute, attacking people that have had no link at all with the terrible instance that we saw in Southport last week.
"And it is absolutely right that the Government is saying that they will take firm action - they should and could have been quicker. I think it's worrying that it's only today that Cobra is going to meet.”
The Home Office announced on Sunday that mosques would be offered greater protection under a new “rapid response process” designed to quickly tackle the threat of further attacks on places of worship.
A large crowd gathered outside a mosque in Middlesbrough on Sunday night and others have also been targeted.
In Rotherham, anti-immigration rioters smashed the windows of the Holiday Inn Express before starting fires.
At least 10 officers were injured, including one who was knocked unconscious, South Yorkshire Police confirmed later, saying one person had already been arrested and others involved should “expect us to be at their doors very soon”.
Masked men hurled lengths of wood, chairs and bottles, and sprayed fire extinguishers at officers outside after some 700 people gathered.
A similar incident played out at a Holiday Inn hotel in Tamworth into Sunday evening, where reports suggested asylum seekers were also being housed.
People threw projectiles, smashed windows, started fires and targeted officers, Staffordshire Police said.
A group of rioters in Middlesbrough smashed the windows of houses and cars and threw objects at officers on Sunday afternoon, with one seen shouting a racial slur and another telling police: “It’s our f****** country.”
There were 43 arrests, and significant damage was caused to the Crown Court and the University, Cleveland Police said.
Greater Manchester Police issued a Section 60AA order amid disturbances in Bolton, requiring people to “remove face coverings used to disguise or conceal their appearance”.
Violence has broken out in several parts of England and Northern Ireland following the killing of three young girls in Southport last week.
The widespread unrest poses the biggest challenge yet to Sir Keir’s premiership, with MPs including Ian Byrne and Dame Priti Patel saying Parliament should be recalled as it was in 2011 so the Commons could debate the riots.
The former first minister of Scotland Humza Yousaf said the army should be called in to stop “thugs” causing disorder on the streets.
Ministers have so far insisted police have the resources required to respond and have rejected calls to bring in the army.
Sir Keir said he wanted those who “feel targeted because of the colour of their skin” to know “this violent mob do not represent our country”.
In his message to rioters, the Prime Minister said: “I guarantee you will regret taking part in this disorder, whether directly or those whipping up this action online and then running away themselves.”
Dame Sara Khan, who was Rishi Sunak’s independent adviser for social cohesion and resilience until May, blamed the Conservative government for leaving the country open to far-right violence.
“The writing was clearly on the wall for some time,” she told the Guardian.
