MANILA - The Philippine National Police (PNP) is ready to face a proposed legislative inquiry into the spate of killings of suspected drug criminals.

PNP spokesperson Senior Supt. Dionardo Carlos on Sunday said they are consulting with Solicitor General Jose Calida in connection to Senator Leila De Lima's resolution for an investigation on the rising number of supposed drug personalities being killed in police operations and vigilante attacks.

At the same time, Carlos urged the public to file formal complaints on alleged irregularities during police operations, which may be used by investigating bodies.

"Ang hinihiling po namin sa tao ay iyung kanilang pagbibigay ng salaysay at detalye kung sila po ay mayroong reklamo, napapansinsing iregularidad o mali po sa aming operational procedure," the police official said in a radio dzMM interview.

"Hindi po pwedeng tayo'y nagsasabing mali po ang ginawa pero hindi natin ito ginagawang official statement," he added.

(MAP, CHARTS: The death toll of the war on drugs)

Carlos also guaranteed that administrative and criminal charges will be filed against policemen who used unnecessary force on suspects.

"It is the stand of the chief PNP that we do not condone any violation of the rights of the public, of the people, of the suspect," he said.

De Lima, in her resolution, cited a broadsheet report which states that "the death toll of extrajudicial and summary killings had already reached 136" in just 13 days since the start of the Duterte administration, from June 30 to July 12, 2016.

De Lima also cited the ABS-CBN Investigative and Research Group's report that the body count from May 10 to July 12 had reached 339.

(READ: De Lima formally seeks probe into spate of drug killings)

During the DZMM interview, Carlos admitted that most of the slain suspects were "street level" criminals.

But he stressed that police regional and district offices are already moving against the illegal trade's "big fish."

"Iba po ang estilo o modus po nila so we really have to make sure that our moves are to target them, makuha po iyung mas malaking bulto ng droga na kanilang ibinibenta," Carlos said.