MANILA — Lawmakers in the Philippines on Monday threw out an impeachment complaint against President Rodrigo Duterte that accused him of orchestrating the mass murder of thousands of people in his crackdown on drug use.

The Justice Committee of the House of Representatives, which is controlled by Duterte backers, reviewed the complaint and declared it insufficient.

The majority leader, Rudy Fariñas, said that Congressman Gary Alejano, who initiated the complaint, had no “personal knowledge” of the allegations, which he said were taken largely from news reports of the killings.

Mr. Alejano said the action to stop the complaint showed the government’s unwillingness to act. Since Mr. Duterte became president in June, more than 4,000 people have been killed by the police in antidrug operations or by vigilantes in drug-related cases, according to police statistics.