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Associated Press
Fish carcasses litter the Jacarepagua lagoon shore in front of Olympic Park, in Rio de Janeiro, Brazil, Saturday, Aug. 29, 2015. Thousands of tilapia, sea bass and mullets started washing up Friday. Brazilian environmentalist and biologist Mario Moscatelli says the fish most likely died because of insufficient oxygen due to pollutants and untreated human waste flowing into the lagoon from nearby condominiums and sprawling shantytowns. (AP Photo/Silvia Izquierdo)

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