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Oil spewing from BP's ruptured undersea well in the Gulf of Mexico has now reached the US coast, choking marshlands and fragile marine life.

Amid the massive mop-up operation, Al Jazeera's John Terrett takes a boat ride around southern Louisiana's coast.

The thick slick is already causing the local economy and the environment massive damage, but many fear the worst is yet to come.

Source: Al Jazeera