People were still looking on and taking pictures

Witnesses reported gangs barricaded themselves and threw rocks at passing motorists.The Telegraph reported residents have begun forming human chains to defend their homes.Prime Minister David Cameron, cutting short his vacation because of the riots, vowed to restore order and called Parliament back into session Thursday in response to the "sickening scenes.

A resident of London's Ealing area was said to be "in critical condition after facing rioters," The Daily Telegraph reported.Police in Manchester warned people to stay away from the city's downtown area because of the unrest. 9 (UPI) -- Groups of hooded and masked youth moved throughout London and other cities Tuesday as police and citizens girded themselves for another night of violence. "Whenever people tried, people in the line rounded on them and they would turn back.France, Austria and Italy issued travel advisories warning their citizens to use caution when visiting Britain, especially if they're going to city centers at night. China questioned whether London could provide adequate protection during next year's Summer Olympics, a comment dismissed by British officials, the Telegraph said." The unrest began Saturday after a peaceful protest in London's Tottenham neighborhood over the fatal shooting of a man by police. Scotland Yard said a 26-year-old man found shot in a car in Croydon during rioting China bearing manufacturer in the south London town died at a hospital. This happened fairly regularly, in fairly small groups.. Parts of London were virtual lock-down with massive looting, attacks on journalists and fires started in residences, businesses and government facilities, British media reported.The London Metropolitan Police deployed 16,000 police officers and canceled leave to deal with the widespread violence engulfing London. The police said a Wigan man was arrested on suspicion of using social media to incite disorder.London police, residents gird for violenceLONDON, Aug.

Officials in Birmingham, Liverpool, Nottingham and Bristol also reported violence, including police vehicles being burned, stores looted, buildings set ablaze, violent confrontations and scores of arrests."People were still looking on and taking pictures but we weren't letting anyone in a mask or hood through," Clapham Junction resident John Comyn said. Police leaders also have been discussing whether to use plastic bullets as a response if necessary