More than half of the world's chemical weapons stockpiles have been destroyed in the 13 years since the UN Chemical Weapons Convention entered into force, dpa quoted UN Secretary General Ban Ki- Moon as saying today. Ban said the Organization for the Prohibition of Chemical Weapons, which was set up to monitor the convention, has certified the destruction of 58 per cent of the weapons as of the end of March. It has also verified that 89 per cent of chemical weapons production facilities have been destroyed and converted to peaceful uses. Countries that have begun eliminating their stockpiles include the United States, Russia and Iraq, while others like Libya, Albania and India have reported total destruction of their chemical weapons. The organization has also conducted more than 4,000 inspections in 81 countries that signed the convention, including verification at commercial enterprises. "On this annual observance, let us honour the victims of chemical warfare by reaffirming our commitment to strengthening the convention," Ban said. "Let us also remember the suffering of families of these victims as we work together to free the world once and for all, from the horror of each and every weapon of mass destruction."