Philippine National Police (PNP) Director General Ronald Dela Rosa takes the oath during the start of a hearing investigating drug-related killings at the Senate headquarters in Pasay city, metro Manila, Philippines August 22, 2016. REUTERS/Romeo Ranoco

Philippine National Police (PNP) Director General Ronald Dela Rosa takes the oath during the start of a hearing investigating drug-related killings at the Senate headquarters in Pasay city, metro Manila, Philippines August 22, 2016. REUTERS/Romeo Ranoco

Philippine National Police (PNP) Director General Ronald Dela Rosa takes the oath during the start of a hearing investigating drug-related killings at the Senate headquarters in Pasay city, metro Manila, Philippines August 22, 2016. REUTERS/Romeo Ranoco

August 23, 2016 5:35 AM (UTC+8)