London violence extends into third day

NEW: Prime minister returns to London from holidayNEW: Disturbances reported in BirminghamHome Secretary May: Those responsible will face consequencesThirty-five police officers have been injuredEditor's Note: Are you there? Send your videos, stories and photos to CNN iReport.
London (CNN) -- Violence that appears to have initially been sparked by last week's shooting death of a 29-year-old man broke out for a third consecutive day Monday -- this time in daylight -- with gangs of youths marauding through areas of London.
Street disturbances appeared to have spread to Birmingham, about 120 miles from London, where police said "several premises" in the city center had been attacked "with some shop windows smashed and property stolen in various locations." A police spokeswoman in Birmingham said extra officers were on patrol.
The office of British Prime Minister David Cameron announced that Cameron would be returning to London Monday night, cutting short a vacation in Italy, for meetings to discuss the violence.
As disturbances flared in various parts of London, an official from the London Fire Brigade told CNN: "We are now too busy now to take any calls from the media."
In the Hackney area of east London, gangs attacked a police car and shops. Video showed riot police involved in skirmishes, youths destroying a police car, smashing shop windows, a sporting goods shop being looted and the window of another shop being smashed.
In Lewisham in south London, a car was set afire. "This is just thugs wanting to intimidate people," Councillor Michael Harris told the BBC. "We've had good community relations in Lewisham and it's simply not justified." He described the people carrying out the acts as young people whose faces were covered with masks.
Several hundred people in the center of Peckham in South London threw projectiles -- stones, clay pots and bottles -- with one policeman saying, "they raided the bottle bank," CNN's Dan Rivers reported from the scene.
Large numbers of them, many with faces covered by shirts and bandannas, rushed back and forth with police -- in far fewer numbers -- standing their ground at the entrances to roads, Rivers said.
Police created a cordon around Clapham Junction, one of London's busiest train stations, with trains unable to go to or from the station. There was no obvious sign of violence at the station but a policewoman told CNN it was not safe for people to go near the station. The policewoman did not explain why.
The renewed unrest came after police announced the arrest of more than 100 people Sunday and Monday in connection with riots Saturday night in the city's Tottenham neighborhood and continued violence in isolated outbreaks elsewhere in the city on Sunday.
The violence started in the ethnically diverse, working-class suburb north of London's center whose residents are predominantly Afro-Caribbean. Saturday's riots occurred after the shooting death Thursday of Mark Duggan, a black man, as he was seated inside a cab.
Officers from Operation Trident -- the Metropolitan Police unit that deals with gun crime in London's black communities -- stopped the cab during an attempted arrest and soon afterward shots were fired, the Independent Police Complaints Commission (IPCC) said. Duggan, a father of four, was fatally shot. Shooting deaths are rare in England.
The commission divulged neither who shot Duggan nor why police had stopped the cab.
Some reports suggested that Duggan was held down by police and shot in the head, but the IPCC has denied this.
"Speculation that Mark Duggan was 'assassinated' in an execution style involving a number of shots to the head are categorically untrue," the IPCC said in a statement.
A British police watchdog group said evidence from Thursday's shooting scene, including a nonpolice firearm, was to undergo forensic testing.
The man's family and friends, who blamed police for the death, gathered Saturday night outside the Tottenham police station to protest.
The protest began peacefully but soon devolved into riots as demonstrators -- whose numbers included whites and blacks -- tossed petrol bombs, looted stores and burned police cars.
Sunday night and Monday morning's arrests were separate from 61 others made Saturday night and Sunday morning. Sixteen people were charged, and at least 17 people were released on bail, police said.
The unrest prompted Home Secretary Theresa May to cut short her summer vacation and return Monday afternoon to London.
In all, 35 police officers have been injured since the violence broke out, Metropolitan Police said.
On Monday morning, residents of the commercial center of Brixton south of London awoke to see the aftermath of Sunday night's sporadic shooting in the commercial center. A KFC's windows were smashed, a Foot Locker store was burned, and the main street was closed as police investigators combed through the area looking for evidence.
Police said they were reviewing closed-circuit television footage in an attempt to identify looters.
Looting also occurred in pockets of Enfield, next to Tottenham, in London's north end.
"The scenes of violence and destruction over the weekend are utterly appalling," said London Mayor Boris Johnson, in a statement. "People have lost their homes, businesses and livelihoods through mindless violence. I understand the need for urgent answers into the shooting incident that resulted in the death of a young local man, and I've sought reassurances that the IPCC are doing exactly that. But let's be clear these acts of sheer criminality across London are nothing to do with this incident and must stop now."
A representative of Johnson said Monday evening that he was cutting short his family holiday in North America to return to London.
Police said the rioting and looting in other parts of the capital were "copycat" events conducted by opportunists and criminals.
"This is not about the black community and the police, it's about young people and the police," said Shaun Bailey, a youth worker, in a statement circulated by the mayor's office. "And let's not beat around the bush and pretend this is some type of social justice protest -- it's sheer criminality."
The specter that such violence could arise had been a concern to David Lammy long before the weekend. The Labour MP for Tottenham told a reporter in March that Tottenham could become a scene of violence as cuts to social-service programs for youths were implemented.
"It's heartbreaking," he told the Tottenham & Wood Green Journal. "I'm really worried that the social experiment that we're seeing from the Tory-led coalition will lead to scenes akin to something that we see in some of the inner-city areas of America and that's why we need to bring this government down."
But the leader of Enfield Council, Doug Taylor, was unmoved. "There can be no justification for the violence and the looting," the Labour Party member told a reporter.
Deputy Prime Minister Nicholas Clegg called the rioters "opportunists -- cynical folks who are indulging in smash-and-grab criminality."
Police say they have evidence that some of the rioting was coordinated using social media, including Twitter.
Tottenham was the site of riots before. In 1985 Floyd Jarrett, who was of Afro-Caribbean origin, was stopped by police near the Broadwater Farm estate in Tottenham on suspicion of driving with a forged tax disc, a document all British vehicles must carry.
A few hours later, officers raided the nearby home of his mother, who collapsed and died during the raid. Rioting erupted shortly afterwards. Like the current violence, a protest outside Tottenham Police Station sparked the 1985 conflict.CNN's Annabel Archer, Phil Black, David Wilkinson, Atika Shubert, Bryony Jones, Erin McLaughlin, Bharati Naik, Aliza Kassim and David Wilkinson contributed to this report.

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