British police have arrested a teenager and raided a house near London in their hunt for whoever planted Friday’s bomb on a commuter train that injured some 30 people.<br /><br />Frightened residents in a suburban street at Sunbury in Surrey were told to quickly leave their homes by police as the nearby property was raided and the surrounding area evacuated.<br /><br />UK media reports said the house was home to an elderly couple known to have fostered children and young people and who had been honoured for their work with child refugees. <br /><br />Penelope and Ronald Jones received MBEs – awards in recognition of outstanding achievement or service to the community – from the Queen in 2010.<br /><br />Local residents were told they would not be able to return to their homes on Saturday night and were due to be put up in emergency accommodation.<br /><br />The raid came five hours after an 18-year-old man was detained at the southern port of Dover in what police and Britain’s interior minister say is a very “significant arrest”. Suspected of terrorism, he was due to be taken to London.<br /><br />The UK government says the terror threat level remains at “critical” as the police operation continues.<br /><br />Armed police patrolled London streets near government departments and guarded Premier League football grounds as matches were held.<br /><br />Earlier Prime Minister Theresa May said the public should not be alarmed by armed officers on the streets.<br /><br />Soldiers and police have also been deployed to protect strategic locations such as nuclear plants and defence sites.<br /><br />Police have described as “routine” the claim by the self-proclaimed Islamic State that it was behind Friday’s attack, the fifth in Britain this year.<br /><br />Britain’s chief police officer, Metropolitan Police Commissioner Cressida Dick, called it “cowardly and indiscriminate”. <br /><br />The improvised explosive device is thought to have contained a timer and apparently failed to detonate fully when it went off on a packed overground tube train during morning rush hour in southwest London.<br />
