The International Narcotics Control Board (INCB) says it is concerned by the approval by Uruguayan MPs of a bill which would legalise marijuana.

The INCB says the law would "be in complete contravention to the provisions of the international drug treaties to which Uruguay is party".

Under the new law, the state would assume control of growing and selling cannabis to registered users.

The bill still needs to be passed by Uruguay's senate before becoming law.