John Burns and Alan Cowell on the UK riots.

Mr. Cameron had hesitated for two days to abandon his summer break at a villa in Tuscany as the looting and arson spread across London, and then to other cities, from its start in the Tottenham area in northeast London after Mark Duggan, 29, who was said by the police to have been a local gang member, was shot and killed by an officer last week.

On Tuesday, a police oversight body said that forensic tests had shown that both shots fired at the scene had come from a police officer’s Heckler and Koch submachine gun, and that the tests had so far shown no evidence that the loaded Italian-made BBM pistol carried by Mr. Duggan had been fired in the confrontation.

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For the moment, though, the circumstances of Mr. Duggan’s death appeared to be remote from the forces driving the riots, at least in the assessment of many of those who are most familiar with the neighborhoods affected. Community organizers, neighborhood residents and members of Parliament who represent the districts, including several who, like Mr. Duggan, were of Afro-Caribbean descent, have said, overwhelmingly, that his death, while providing the original trigger for the violence, has had little or nothing to do with the looting and arson.