The Philippine Drug Enforcement Agency (PDEA) is investigating the possible involvement of some Quezon City policemen in the illegal drug operations of a Chinese drug group cell.

PDEA Director General Dionisio Santiago told ABS-CBN News that their agents' saw during a surveillance operation a Quezon City police mobile car fetching Mylene Donato and her husband Peter Ang from their condominium unit along Amoranto Street, Quezon City.

Santiago revealed the information during Wednesday night's raid at the couple's unit, which has been allegedly turned into a shabu "kitchen-lab."

Superintendent Norberto Babagay, commander of the Quezon City Police District (QCPD) Station 1, which holds jurisdiction of Amoranto area, declined to commend. He said he would have to verify PDEA's information first before reacting.

Chief Superintendent Roberto Rosales, Metro Manila police director, said he would order the QCPD to look into PDEA's information and identify the policemen.

PDEA agents, joined by several members of the Manila Police District, swooped down on the condominium unit around 8 p.m., but failed to arrest the couple.

Security guards of the condominium told police that the couple started renting the unit last year. They said they last saw the couple on March 16.

Santiago said the couple could have sensed that the PDEA and police agents are gaining on them after the arrest of their fellow "Tiger Group" members, Cai Xihe and Victor Chiu, who are both alleged shabu chemists of the Chinese drug mafia.

Seized from the couple's kitchen-lab were 25 grams of suspected shabu (methamphetamine hydrochloride) worth P50,000 and shabu-making chemicals and paraphernalia.

Santiago said the raid was the fourth in a series of operations being conducted by the PDEA to dismantle the Tiger Group.

The first shabu lab of the Tiger Group was discovered by PDEA agents in Cainta, Rizal, which was followed by the discovery of another kitchen-lab in Sta. Cruz, Manila and Talayan Village in Quezon City. With a report from Gretchen Malalad, ABS-CBN News