Initial reports are of 200 feet high flames at oil terminals and fuel depots. Reports that I have read include witnesses who saw a plane fly into one of the structures. Another London terror attack? A pilot's error? Aeroplane malfunction? (Shaking my head in disbelief at the state of this planet).
I will update this posting as details become clearer.
UPDATE: Reports of 8 dead. UK police saying there's nothing more sinister than an accident involved here.