Four explosions rocked three tube stations and a bus at midday today bringing back grim memories of the July 7 terror attack but there was no casualty.Immediately after the explosions at Oval, Shepherd's Bush and Warren Street Subway Stations and a bus on Hackney Road in East London, the British Capital was put on high alert. All the affected underground stations were evacuated and emergency services swung into action.One person, who was in mid twenties and appeared to be of Asian or middle eastern origin, was picked up by the police from the downing street area.British prime minister Tony Blair, who was briefed about the explosions by London police chief Sir Ian Blair, told that four explosions had rocked London but "fortunately there was no casualty.Terming the incidents as "serious", Blair said "You can't minimise incidents such as these.""What i would like to say is this that we know why these things are done, they are done to scare people and to frighten them and to make them anxious and worried," he told a joint news conference with visiting Australian prime minister John Howard.
