An initial report stated that a series of three explosions was heard at an oil depot in Hemel Hempstead, some 25 miles north of London.

Witnesses describe large explosions, rescue forces are on their way to the scene.More about:Londonfunction initServerVars() {_headup.clientHost = 'http://newstopics.jpost.com';_headup.termsFromServer = 'London';_headup.annotatedTerms = 0;_headup.widgetMode = 'snippet';_headup.snippetButtonStyle = 'banner';_headup.blackListedUrl = false;}