A man with a large knife is believed to have been shot with a Taser by police after going on a bloody rampage on a high-speed train after it left Peterborough station in Cambridgeshire on Saturday evening. British Transport Police (BTP) declared a major incident and said two people were arrested after the train was stopped at Huntingdon station. Police also declared "Plato", the national code word used by police and emergency services when responding to a "marauding terror attack", before the declaration was later rescinded.