Greenpeace activists clash with French police during a protest against the imminent arrival of two BNFL (British Nuclear Fuels) ships, which are carrying 140kg of radioactive weapons-grade plutonium.The activists obstructed the road between the Cherbourg military port and a reprocessing complex on the la Hague peninsula.The road will be used for transporting the dangerous cargo, which Greenpeace believes is highly vulnerable to accidents or deliberate attack.