BEIJING, April 12 (Xinhua) -- A drug factory in Batangas province, the Philippines, was busted through joint efforts by Chinese and Philippine police on Thursday after seven months of investigations, according to China's Ministry of Public Security (MPS).

Police arrested seven suspects, including four Chinese nationals and three Philippine nationals at the drug factory on a farm.

Another four suspects were arrested in east China's Fujian Province.

Half-made methamphetamine,drug-making raw materials and equipment were seized in the joint operation.

Clue to the cross-border drug manufacture and sales case was uncovered last September by Fujian police, who learned that a drug baron was planning to hire Chinese workers to make methamphetamine in the Philippines.