BAGHDAD — The Basra police commander on Friday said the roadside bomb used in an attack that killed four British soldiers had not been used in southern Iraq before, and his description of the deadly weapon indicated it was a feared Iranian-designed explosively formed projectile. Anbar province has been a stronghold of the Sunni insurgency but many tribes in the region recently switched allegiance, with large numbers of military-age men joining the police force and Iraqi army in a bid to expel Al Qaeda in Iraq fighters. The U.S. military has claimed Iran is supplying Shiite militia fighters in Iraq...