MANILA — Fifty-eight people suspected of selling or using drugs have been killed in Manila and its northern suburbs in just three days, making this the deadliest week so far in President Rodrigo Duterte’s monthslong drug crackdown, the police said Thursday.

On Wednesday night, 26 suspects were gunned down in “one-time, big-time” simultaneous raids in Manila, said Senior Superintendent Erwin Margarejo, a district police spokesman.

The police in Bulacan Province, just north of Manila, used the same terms to describe their own operations earlier in the week. From Monday night till dawn Tuesday, they said, 32 people were killed.

To the horror of human rights groups, Mr. Duterte vowed during the presidential campaign last year to turn Manila Bay into a dumping ground for dead addicts and drug dealers. He promised to step down if he failed to rid the Philippines of the drug menace in three to six months.