Four small explosions hit London's transit system, two weeks after 56 people died in a similar attack.
But this time there have been no deaths reported, and only one person injured -- an asthma attack. And police say some of bombs planted failed to detonate, giving them critical forensic evidence that may help to track the attackers.
Prime Minister Tony Blair said of the attacks, "They're done to scare people, to frighten them
and make them worried." Police have made two arrests related to the most recent attacks.
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