Muktar Said Ibrahim, Ramzi Mohammed and Yasin Hassan Omar, who police believe carried backpacks filled with explosives onto subway trains and a city bus on July 21, appeared before a judge amid extremely high security at Belmarsh prison in southeast London. The three men were ordered held until a hearing on Nov. 14, when they will enter pleas on charges that also include conspiracy and explosives offenses.

Ibrahim, 27, is a refugee from Eritrea who came to Britain when he was 14. Omar, 24, came to Britain at age 11 as a refugee from Somalia. Mohammed, 23, was also born in Somalia, according to media reports. A fourth suspected bomber, Isaac Hamdi, is in custody in Rome, where he was arrested after allegedly fleeing following the attacks. British authorities are seeking his extradition. Hamdi, 27, is a naturalized British citizen born in Ethiopia.

Also Monday, Sheik Omar Bakri Mohammed flew to Lebanon in the face of Prime Minister Tony Blair's recently announced crackdown on those who support or incite terrorism in Britain, the cleric's spokesman, Anjem Choudary, said. ''He left because as a Muslim you have to go to a place where you can practice your religion and your life is protected,'' Choudary said.

Bakri, who has publicly said he would not tell police if he knew of a planned bomb attack in Britain, has come under intense scrutiny since Friday, when Blair said he would ban the cleric's Islamic organization, al-Muhajiroun, and any of its successors.