London- still seeking technician and quartermaster

The Times of London reports that police are still seeking the technician(s) who designed and built the 7/7 bombs and the 7/21 bombettes as well as the quartermaster(s) who procured the materials for the explosives. The report includes a rough chronology of events as they unfolded throughout the day yesterday. There was also a fifth bomber who got cold feet at the last moment and ran off, leaving his bomb in a rucksack on a park bench. He has also been arrested. British police and security officials are trying to determine how the fourth bomber, arrested in Italy, managed to get out of the country when his photo was widely distributed in railway terminals, docks and airports.