LONDON (AP) — After four home-grown suicide bombers killed 52 London commuters on July 7, 2005, Prime Minister Tony Blair vowed that Britain would stop at nothing to defeat terrorism. The rules of the game are changing. Since the Sept. 11 attacks in the United States four years earlier, Britain had made its anti-terrorism powers among the toughest in the Western world. The ability of intelligence agencies to scoop up Internet users' electronic data expanded vastly, and British spies began collecting information on their own citizens on a hitherto unseen scale. The July 2005 bombings on three subway trains and a bus — the deadliest attack on British soil since World War II — were carried out by young Britons inspired by al-Qaida. In a bid to stop more plots, Blair's government expanded the definition of a terrorist offense and introduced new powers to detain terror suspects. "The overwhelming view from our European colleagues is that the U.K.