LONDON - One was an athletic teenager who had grown into a devout young man, another a soccer-loving convert to Islam. The youngest was 17, the oldest 35. Many were born in Britain and all were reared here. As police held 24 young British Muslims accused of plotting devastating airline bombings, both the authorities and their neighbors sought Friday to understand how ordinary communities spawned a terrifying plot. Police have not identified suspects, but 19 names were made public Friday by the Treasury after the government froze their bank accounts. They have names of Muslim origin, many of them common...