Swathes of London are burning as the most devastating night of rioting so far raged across the capital for a third day.
Home Secretary Theresa May condemned "sheer criminality" as police and emergency services were overwhelmed by a third consecutive night of looting and violence.
Bloody scenes resembling war zones broke out across east and south London after thousands of yobs took to the streets to loot, rob, set fire to property and attack police. The districts of Croydon, Hackney and Peckham saw the fiercest of the latest disturbances with hundreds of shops smashed up and set alight. Police had already made 215 arrests over the previous two days since the first eruption of violence in Tottenham.
As the violence spread to Birmingham, Mr Cameron flew back to Britain to chair the Government's emergency committee Cobra and meet police chiefs.
Deputy Assistant Commissioner Stephen Kavanagh said there were a third more officers on the ground than there were on Sunday night, which was three times more than the previous night.
Mr Kavanagh also apologised to the family of shooting victim Mark Duggan - whose death sparked the original violence. An inquest into Mr Duggan's death is due to open at High Barnet Coroner's Court, the Independent Police Complaints Commission (IPCC) said.
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