MANILA, Philippines (AP) — The Philippine national police chief has resigned after he faced allegations in a Senate hearing that he intervened as a provincial police chief in 2013 to prevent his officers from being prosecuted for allegedly selling a huge quantity of seized drugs.

Gen. Oscar Albayalde said Monday his decision relinquishing his post was accepted by Interior Secretary Eduardo Ano over the weekend but insisted on his innocence, saying he has never been criminally or administratively charged for the alleged irregularity. Albayalde resigned about three weeks before his scheduled retirement on Nov. 8.

The allegations against Albayalde were the latest dark cloud to loom over the national police force, which has largely been enforcing President Rodrigo Duterte's bloody anti-drug crackdown that has left thousands of mostly petty drug suspects dead.