Acting Metropolitan Police Commissioner Tim Godwin arrives in Downing Street in London, to attend a Cobra meeting to discuss the recent riots in the capital and across the country.

A burnt-out car is seen on a street in Hackney, London, Tuesday, Aug. 9, 2011, following unrest on late Monday. A wave of violence and looting raged across London and spread to three other major British cities Tuesday, as authorities struggled to contain the country's worst unrest since race riots set the capital ablaze in the 1980s. (AP Photo/Akira Suemori)

Burning garbage bins are set on fire by rioters in Hackney, east London, Monday Aug. 8, 2011. Youths set fire to shops and vehicles in a host of areas of London _ which will host next summer's Olympic Games _ and clashed with police in the nation's central city of Birmingham, as authorities struggled to halt groups of rampaging young people. (AP Photo/Lefteris Pitarakis)

A toy left by a protester is backdropped by a burning car and garbage bins set on fire by rioters in Hackney, east London, Monday Aug. 8, 2011. A chaotic wave of violence and looting raged across London and spread to three other major British cities on Tuesday, as authorities struggled to contain the country's worst unrest since race riots set the capital ablaze in the 1980s. (AP Photo/Lefteris Pitarakis)

British police officers are deployed during riots in Hackney, east London, Monday Aug. 8, 2011. Youths set fire to shops and vehicles in a host of areas of London _ which will host next summer's Olympic Games _ and clashed with police in the nation's central city of Birmingham, as authorities struggled to halt groups of rampaging young people. (AP Photo/Lefteris Pitarakis)

Youths joke as they have their pictures taken in front of a car burning after it was set on fire by rioters in Hackney, east London, Monday Aug. 8, 2011. A chaotic wave of violence and looting raged across London and spread to three other major British cities on Tuesday, as authorities struggled to contain the country's worst unrest since race riots set the capital ablaze in the 1980s. (AP Photo/Lefteris Pitarakis)

A masked youth pulls a burning garbage bin set on fire by rioters in Hackney, east London, Monday Aug. 8, 2011. A chaotic wave of violence and looting raged across London and spread to three other major British cities on Tuesday, as authorities struggled to contain the country's worst unrest since race riots set the capital ablaze in the 1980s. (AP Photo/Lefteris Pitarakis)

A photographer holds his head after he was attacked by protesters in Hackney, east London, Monday, Aug. 8, 2011. Violence and looting spread across some of London's most impoverished neighborhoods on Monday, with youths setting fire to shops and vehicles, during a third day of rioting in the city that will host next summer's Olympic Games. (AP Photo/Karel Prinsloo)

Smoke rises from a burning Sony distribution center reportedly set alight by rioters,in Enfield, north London, Tuesday Aug. 9 2011. A wave of violence and looting has raged across London since Saturday, as authorities struggled to contain the country's worst unrest since race riots set the capital ablaze in the 1980s. Some 525 arrests have been made in London alone and dozens were arrested in other cities. Police announced Tuesday that plastic bullets would be "one of the tactics" available to officers to quell the riots.(AP Photo/Akira Suemori)

Local residents who volunteered to clean up following rioting, pose for the media in Battersea, south London, Tuesday Aug. 9, 2011. A wave of violence and looting has raged across London since Saturday, as authorities struggled to contain the country's worst unrest since race riots set the capital ablaze in the 1980s. Some 525 arrests have been made in London alone and dozens were arrested in other cities. Police announced Tuesday that plastic bullets would be "one of the tactics" available to officers to quell the riots. (AP Photo/Matt Dunham)