UNITED NATIONS (AP) — A Boston-based human rights group says it will sue the United Nations in 60 days if the world body does not agree to compensate Haitian cholera victims, apologize to the Caribbean nation for introducing the disease through its peacekeeping force and launch a major effort to improve sanitation.

Lawyers Haiti's Institute for Justice and Democracy said Wednesday they hoped to settle with the United Nations but are ready to go to court in New York if that fails.

A U.N. letter in February said it is legally immune and not responsible for the cholera outbreak that has sickened nearly 500,000 people and killed more than 7,750 people since the outbreak began in October 2010.

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Independent studies suggest that the disease was inadvertently brought to Haiti by U.N. peacekeepers from Nepal.

(Photo: THONY BELIZAIRE/AFP/Getty Images)