Two police officers look towards a plume of smoke rising from Buncefield Oil Terminal, in Hemel Hempstead, England, Sunday Dec. 11, 2005. A series of explosions at one of Britain's largest oil depots shook an area north of London early Sunday, shattering windows and sending billowing clouds of smoke and flames high into the sky. Police said the blasts appeared to be accidental. (AP Photo/Alastair Grant)