Over 1500 people have been arrested, including three over the deaths of three men who were hit by a car in Birmingham while protecting shops from looters.
It came as British Prime Minister David Cameron told Parliament he would look to the United States for solutions to gang violence, promising authorities would get strong powers to stop street mayhem erupting again.
Decisive action
Cameron told lawmakers he was "are acting decisively to restore order on our streets."
Acknowledging that police had been overwhelmed by mobile groups of looters in the first nights of the rioting, Cameron said authorities were considering new powers, including allowing police to order thugs to remove masks or hoods, evicting troublemakers from subsidized housing and temporarily disabling cell phone instant messaging services.
He said the 16,000 police deployed on London's streets to deter rioters and reassure residents would remain through the weekend.
"We will not let a violent few beat us," Cameron said.
During a Parliament session lasting almost three hours in which he faced 160 questions from lawmakers, Cameron promised tough measures to stop further violence and said "nothing should be off the table."
He said that included water cannon and plastic bullets though senior police have said they don't feel the need to use those at the moment. He also said officials would look at "whether there are tasks that the army could undertake that would free up more police for the front line."
Arrests over men killed protecting shops from looters
Cameron's strong stand came as detectives arrested two youths and a man on suspicion of murder after three men were hit by a car in Birmingham while protecting shops from looters have
West Midlands Police said the suspects - aged 16, 17 and 26 and all from Birmingham - had been detained by officers.
Witnesses and family members said the victims had been part of a group protecting the Winson Green area of the city from looting after local people had left a local mosque.
The father of Haroon Jahan, one of the men who died, said the hit-and-run incident "makes no sense".
"I've got no words to describe why he was taken and why this has happened and what's happening to the whole of England," Tariq Jahan told the BBC.
"It makes no sense why people are behaving in this way and taking the lives of three innocent people."
Another witness said the incident happened after a car was set ablaze in a nearby street and youths gathered, prompting local people to defend a local shopping area.
"They lost their lives for other people, doing the job of the police," Mohammed Shakiel said outside the hospital where the men were taken, prompting around 200 people to gather in support.
"They were protecting the community as a whole."
Social media in the spotlight
Cameron has also said the government was looking at banning potential troublemakers from using social media, after it was used to organise riots across Britain this week.
"Everyone watching these horrific actions will be struck by how they were organised by social media. Free flow of information can be used for good. But it can also be used for ill,'' he told lawmakers.
"And when people are using social media for violence we need to stop them.
"So we are working with the police, the intelligence services and industry to look at whether it would be right to stop people communicating via these websites and services when we know they are plotting violence, disorder and criminality.''
Numerous people have been arrested across Britain for allegedly using Facebook, Twitter and BlackBerry Messenger (BBM) to incite violence during the riots that laid waste to parts of London and other major British cities.
Nathan Sinden, 27, appeared in court in Hastings on the southern English coast on Thursday for allegedly inciting criminal damage and burglary.
The court heard that messages included: "Let's start a riot in Hastings. Who is on it?'' and "Looting it is then today. Who is up for shopping?''
Police in Hampshire, southern England, have also arrested a man, 27, and woman, 25, on suspicion of using Twitter to incite violence, and a third, 27, for using BBM, an encrypted alternative to texting in which messages can be shared.
