United Nations agencies say it will cost up to $50 million to clean up an oil spill caused by Israel's bombing of a Lebanese power plant last month.

U.N. officials met experts from Lebanon, Greece, Syria, Turkey and the European Union Thursday in Athens to discuss the 15,000-ton oil slick.

Authorities say four weeks of fighting following the spill kept them from assessing the damage, but they say this week's cease-fire makes it possible to deal with it.

Officials warn the spill has already caused severe damage to the coastline and may also have badly affected the region's marine life.

Some information for this report was provided by AP and Reuters.