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The arrests of the July 21 bombing suspects may turn out to be easier than what comes next. Of the July 7 and July 21 suspects, only one had previously even tweaked the interest of the security services, implying that a lot more networks of homegrown terrorists could be out there--Pakistani, Somali, Eritrean, Jamaican, North African, perhaps many others in a country with 1.6 million Muslims. In a poll of British Muslims published last week, 4% of those surveyed said they believe "it is acceptable for religious or political groups to use violence for political ends." One official estimates there are at least 800 Muslims in Britain with jihadist leanings--half of whom are British citizens--who ought to be under surveillance or deported. Following last week's sweep, investigators are turning their attention to "the support networks for these men," says a police source. Until the networks are destroyed, says antiterrorism chief Clarke, "the threat remains and is very real." --Reported by Theunis Bates, Jessica Carsen and Helen Gibson/London, Lillian Kennett/Birmingham and Douglas Waller/ Washington