KUNMING, April 26 (Xinhua) -- Police in southwest China's Yunnan Province busted a drug trafficking case with three suspects arrested and over 10 kg of heroin seized.

The public security bureau of Yanshan County launched an investigation after they got a clue one month ago that a man was suspected of drug trafficking, according to the bureau.

In early April, the police arrested three suspects in a rental house and seized about 10.5 kg of heroin.

The details of the case were not disclosed until Thursday. The case is under further investigation.

Yunnan is a major front in China's battle against drug crime, as it borders the Golden Triangle known for its rampant drug production and trafficking.