MANILA - Kian Loyd delos Santos, who was allegedly killed in a gunfight with police officers in Caloocan, tested negative for gunpowder residue, based on paraffin tests conducted by the Philippine National Police Crime Laboratory.

LOOK: PNP Crime Lab paraffin test on Kian's hands yielded negative for presence of gunpowder nitrates. @ABSCBNNews @DZMMTeleRadyo @ANCALERTS pic.twitter.com/OIUIvqKU5q

— Maan Macapagal (@maan_macapagal) August 23, 2017

The PNP Crime Laboratory earlier said the 17-year-old boy sustained 2 gunshot wounds to the head. A previous autopsy by the Public Attorney's Office said Kian sustained 3 gunshot wounds - 2 to the head and one in the back.

Public outrage has been growing over Delos Santos' death, which has been decried as a summary execution under the administration's war on illegal drugs.

A CCTV footage showed that two cops in civilian clothes accosted Delos Santos towards the direction where he was killed. Witnesses also said they saw the officers blindfold and beat the teenager before the shooting. They added that Delos Santos was killed even while he was already pleading for his life.

• LOOK: Caloocan cops linked to Kian slay named

Witnesses said they followed the cops and saw how they handed a gun to Delos Santos and instructed him to shoot then run. When he heeded these instructions, the teenager was shot dead.
The cops linked to the death of Delos Santos initially denied it was them but later on retracted, the PNP Internal Affairs Service (IAS) said.

• Binatilyo, patay nang 'manlaban' sa pulis; pero iba ang kuha sa CCTV

"Yung dalawa na may hawak kay Kian at inaamin din na si Kian yung hawak nila ay voluntary na pumunta, hindi po pinatawag ng IAS at sinabi niya doon sa IAS investigator na sila nga yun, na sila ngang dalawa at si Kian nga yun," said Inspector General Alfegar Triambulo, PNP IAS chief.--report from Maan Macapagal, ABS-CBN News