Minor explosions using detonators only have sparked the evacuation of three Tube stations and the closure of three lines, a BBC correspondent has said. Police cordoned off large areas around Warren Street, Oval and one of the Shepherd’s Bush Tube stations. A route 26 bus in Hackney Road in Bethnal Green had its windows blown out by a blast. There were no injuries. Police in London say they are not treating the situation as "a major incident yet".