Sister of an extra-judicial killing victim wears a sash with a call to stop the killings in the administration’s drug war. File photo / INQUIRER.net CAGAYAN DE ORO CITY — Ten years after

Human rights groups believe the true death toll could be in the tens of thousands, arguing that many killings went undocumented.

Sister of an extra-judicial killing victim wears a sash with a call to stop the killings in the administration’s drug war. File photo / INQUIRER.net CAGAYAN DE ORO CITY — Ten…