British police have begun to shift their London bombing investigation to focus on finding suspects who organised and co-ordinated the two attacks on the city's transport system, scaling back the manhunt after last week's arrests of the four suspected July 21 bombers.

According to police, investigators are looking for individuals who helped with the logistics of the attack - those who built the bombs, recruited the attackers, provided the funding - under the assumption that the bombers themselves were low-level operators with little organisational ability.