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Authorities near the border between Haiti and the Dominican Republic are investigating the mysterious death of scores of fish in a lake.

Environmental officials are testing samples, while the government tries to allay fears that it is linked to a deadly cholera epidemic.

Michel Chancy, the Haitian Agriculture Minister, said: "At this time we cannot connect this problem with cholera. Cholera affects people, not fish. The fish don't have anything to do with cholera. Something else caused this problem. It could be something toxic, a disease."

Samples are currently being tested at laboratories in the Haitian capital and in Mexico.

The cholera epidemic is affecting thousands across a country still struggling to recover from a devastating earthquake.