LONDON — After a bitter parliamentary struggle, Prime Minister Tony Blair yesterday pushed through a new anti-terrorism law that allows terrorism suspects to be kept under tight police control on a judge's order.

The House of Lords approved the measure last night after more than 30 hours of deliberations and it became law. The breakthrough came when Blair agreed that legislators would have the opportunity to reject or rewrite the law next year.

Passage came the same day that a judge freed on bail eight terrorism suspects held for up to three years without charges at London's Belmarsh Prison under an existing anti-terrorism law. Two others had been granted bail Thursday.

The detention of the 10 has long been a source of contention from human-rights officials and activists, and British police have said they are often unable to prove in court their suspicions about the terrorist threat posed by the individuals. Britain's highest court ruled in December that the prison detention was illegal.

Unlike the old law, the new law requires the government to get a judge's approval to issue house-arrest orders, although in an emergency a minister can immediately order the lesser measures and seek court approval within seven days.

Although the suspects were released, the judge set tight conditions for their bail similar to those in the new law. They are required to remain in their homes 12 hours a day, are barred from using their telephones and must wear electronic bracelets that allow police to track their movements. They are also barred from having meetings outside their home or visitors without court permission.

A government minister last night approved the house arrests.

Blair argued that the new anti-terror bill was vital to save the British public from attacks such as the train bombings in Madrid, Spain, that killed 191 people a year ago.

"To continue to try to water down and weaken this legislation is wrong and should be stopped," Blair said before the House of Lords relented.

The best known of the eight released yesterday was Abu Qatada, a Sunni Muslim cleric from Syria who has been described by U.S. and British officials as a spiritual inspiration to the Sept. 11 ringleader Mohamed Atta.