SIMON ISRAEL: Blown apart by a rucksack of high explosives weighing no more than ten pounds and placed on the floor or seat of the upper deck -- that's the result of initial forensic analysis. There is, the police say, no evidence yet to suggest this was the work of a suicide bomber.
Today, the anti-terrorist squad were beginning to put together a picture of what also happened underground. They said that at each site, similar-sized high explosives were used, a size that can fit into a rucksack. How these bombs were detonated is still unclear. There's been no rush to arrest. Instead, the antiterrorist squad special branch and the intelligence services have been liasing with communities they are so dependent on for information.
ANDY HAYMAN: The most important thing that I want to get across to everyone this morning is that we do need the community's help. The community, it binds together at such occasions, and that always come up trumps and given us the information that makes that difference.
SIMON ISRAEL: As if to emphasize that point, Foreign Secretary Charles Clarke had what he described as a "deeply intensive meeting" with faith leaders today in a display of religious unity designed to calm fears.
CHARLES CLARKE: Beliefs of all faiths have committed themselves to continue working together very strongly. And one of the most impressive things about London -- indeed, the whole country -- is that the reaction to these appalling events yesterday has been that community stands together.
SIMON ISRAEL: There's global cooperation, too, in the hunt for the bombers. And police suspect their support network; reports they were after a Moroccan linked to the bombings have been denied, but Channel 4 News has learned a team from Spain, consisting of three Islamist terror experts and two bomb specialists are arriving tomorrow to examine links and similarities to the Madrid bombings.