Doubts emerge over Duggan shooting as London burns

Doubts have emerged over whether Mark Duggan, whose death at the hands of police sparked the weekend's Tottenham riots, was killed during an exchange of fire .

The Guardian understands that initial ballistics tests on a bullet, found lodged in a police radio worn by an officer during Thursday's incident, suggested it was police issue – and therefore had not been fired by Duggan.

On Saturday night 26 police officers were injured, eight requiring hospital treatment, in clashes with around 300 rioters in Tottenham that saw buildings and vehicles torched, shops looted and residents forced to flee their homes.