More than 700 suspected drug users and dealers have been killed by police or vigilantes in the Philippines in under three months, say human rights campaigners, who are approaching the UN to decry the act.

Human Rights Watch, Stop Aids and International HIV/Aids Alliance are among more than 300 civil organizations that have marked joint letters to the International Narcotics Control Board (INCB) and the UN Office on Drugs and Crime (UNODC), approaching them to end their hush over the crackdown.