PIRAEUS, Greece, Aug 17, 2006 (AFP) - International experts on Thursday promised Lebanon immediate help in cleaning up a massive Mediterranean oil spill caused by Israeli bombing of a power plant, but said the scale of the environmental threat remained unknown. Senior officials from the United Nations, the European Union and regional states meeting in the Greek port city of Piraeus unveiled a plan to clean up oil-clogged parts of the Lebanese coastline -- an operation slated to cost over 50 million euros (64 million dollars). The plan, supervised by the United Nations Environment Programme (UNEP) and the International Maritime...