Debris lies on the ground as flames and smoke billow from an oil depot fire near Hemel Hempstead, southeast England December 12, 2005. Fire crews moved in to battle one of Europe's biggest industrial blazes on Monday an inferno at a fuel depot north of London after being held back for 24 hours by heat and environmental worries. REUTERS/Dylan Martinez 

Huge plumes of smoke billow from an oil depot fire in Hemel Hempstead, southeast England, December 11 2005. Explosions tore through a fuel depot north of London on Sunday, spewing out a huge tower of smoke and flame in what officials said could be the biggest incident of its kind in peacetime Europe. Police said there were 43 casualties but only one person appeared to have suffered serious injuries. REUTERS/Toby Melville Pictures of the Month December 2005 

Men watch plumes of smoke rise from an oil depot fire near Hemel Hempstead, southeast England, December 11, 2005. Explosions tore through a fuel depot north of London on Sunday, spewing out a huge tower of smoke and flame in what officials said could be the biggest incident of its kind in peacetime Europe. Police said there were 43 casualties but only one person appeared to have suffered serious injuries. REUTERS/Darren Staples 

Smoke is seen above central London December 11, 2005. Explosions tore through a fuel depot north of London before dawn on Sunday, creating a huge tower of smoke and flame and seriously injuring two people in what police said appeared to be an accident. REUTERS/Rob Dawson 

A general view shows smoke behind the British Telecom Tower in central London December 11, 2005. Explosions tore through a fuel depot north of London before dawn on Sunday, creating a huge tower of smoke and flame and seriously injuring two people in what police said appeared to be an accident. REUTERS/Rob Dawson 

Smoke billows after an explosion at a fuel depot in Hemel Hempstead in central England December 11, 2005. A series of explosions which tore through a fuel depot north of London before dawn on Sunday injured 36 people, four seriously, police said. REUTERS/Paul Hackett Pictures of the Month December 2005 Pictures of the Year 2005 

Smoke billows after an explosion at a fuel depot in Hemel Hempstead in central England December 11, 2005. A series of explosions and a massive fire erupted at the fuel depot north of London before dawn on Sunday and sent a large column of black smoke into the sky, witnesses said. REUTERS/Stephen Hird 

Policemen stand at a police cordon after an explosion at a fuel depot in Hemel Hempstead in central England December 11, 2005. A series of explosions and a massive fire erupted at the fuel depot north of London before dawn on Sunday and sent a large column of black smoke into the sky, witnesses said. REUTERS/Stephen Hird