Severe disruption on tube after "power supply problems"

The Piccadilly and Victoria lines have been severely disrupted and major stations including King’s Cross and Oxford Circus closed after power issues on Monday morning.As of 8.30am, the Underground stations closed were: East Acton, Hampstead, Highbury and Islington, King’s Cross St Pancras, Mornington Crescent, Oxford Circus, Russell Square, and Warren Street.TfL has said this was due to electrical faults at some stations.Transport for London said power supply problems have also led to the Piccadilly’s issues - with no service between Hyde Park Corner and Cockfosters.