[IMG]http://d.yimg.com/a/p/afp/20100430/capt.p***o_1272594399379-1-0.jpg?x=130&y=86&q=85&sig=J39JAQgB1QVt_J2R2PiJcg--[/IMG]AFP - A giant oil slick threatened economic and environmental devastation as it closed in on Louisiana's vulnerable coast, prompting the US government to declare a national disaster.
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