There have been unconfirmed reports of an explosion on the London Underground, and an incident on a bus in Hackney, East London. Follow the discussion here. Stations at Warren Street, Oval and Shepherd's Bush have been closed. British Transport Police say one person has been injured at Warren Street station. Services on the Victoria, Northern and Hammersmith & City Lines have been suspended. Emergency services started receiving calls just after 12.30. [Sky News]