UN Secretary General Ban Ki-moon on Friday expressed "grave concern" at the Burma junta's refusal to free opposition leader Aung San Suu Kyi ahead of a November election.

UN Secretary General Ban Ki-moon, pictured in September 2010, on Friday expressed "grave concern" at the Burma junta's refusal to free opposition leader Aung San Suu Kyi ahead of a November election.

The UN chief accused the junta of being "slow and incomplete" in meeting political commitments and said its refusal to hold talks with the international community was "deeply frustrating".