Officials say a former anti-narcotics officer and a Chinese national have been arrested in a drug bust in the Philippine capital that yielded $6.7 million worth of high-grade crystal methamphetamine.

Philippine Drug Enforcement Agency and police officials said they confiscated 64 kilograms (141 pounds) of crystal meth during a raid Thursday on a Manila house that turned out to be a clandestine narcotics laboratory.

Both suspects were inside the house when it was raided.

Marine Lt. Col. Ferdinand Marcelino, superintendent of a navy training school, was the drug agency's former lead investigator. He has denied links to drug syndicates, saying he was on a legitimate intelligence mission.