UNITED NATIONS (Reuters) - U.S. President Barack Obama said on Tuesday that he and Nigerian President Mohammadu Buhari had discussed ways of countering the Boko Haram militant group.

Speaking to reporters after a meeting with the Nigerian leader on the sidelines of the annual United Nations General Assembly, Obama also praised Buhari for allowing flexibility in exchange rates.

(Reporting By Jeff Mason; Writing by Arshad Mohammed and Grant McCool)