Officials of the Swedish-owned Aznalcollar iron pyrite mine in southern Spain observe the area where an artificial lake broke its banks Saturday, spilling toxic liquid into the Guadiamar River. Authorities said Sunday that emergency measures - building sand and earthen dikes along the edge of Donana Park, one of Europe's most prized nature reserves - have saved the area from an environmental disaster, but groups such as Greenpeace say it is premature to call the emergency over. The massive spill also swamped some 10,000 acres of olive groves and other surrounding agricultural land.