Nearly 9 out of 10 Filipinos support Philippine President Rodrigo Duterte's war on drugs, and almost three quarters believe extrajudicial killings are taking place in the bloody crackdown, an opinion poll showed Monday.

Duterte's signature campaign has killed thousands of Filipinos and caused international alarm, amid widespread allegations by activists that police are executing suspected drug users and dealers.

Police reject that and say every one of the more than 3,900 victims in their anti-narcotics operations were killed because they were armed and had violently resisted arrest.