A boy of 17 is the sixth person to have been arrested in connection with the London Underground bomb at Parsons Green on 15 September. He was detained at a 'halfway house' for asylum- seekers, following police counter-terror operations in Dover, Hounslow and Newport. He is the youngest of the suspects being questioned over a homemade bomb blast that failed to detonate fully but still injured thirty people on a packed train during morning rush hour. IS claimed the attack was carried out by ‘soldiers of the caliphate’. The head of the Metropolitan Police’s counter-terrorism command said, ‘This continues to be a fast-moving investigation. A significant amount of activity has taken place, and searches are continuing at five addresses. Detectives are carrying out extensive inquiries to determine the full facts behind the attack.’