There have been "multiple casualties" after a large explosion in a warehouse in Avonmouth, Avon Fire and Rescue Service have said. Emergency services were called to reports of the blast near Bristol and have been joined at the scene by Avon and Somerset Police officers and South West Ambulance Service medics. Report by Thomasl. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn