More crimes involving drug trafficking into China using international mail parcels were uncovered in 2009 compared to the previous year, said the General Administration of Customs of China (GACC) Wednesday.

The number of such crimes uncovered increased by 210 percent year-on-year, and customs around the country had arrested 80 suspects, GACC said in a statement on its website.

GACC attributed the increased amount of crimes uncovered to the hard work of the ccustoms and the increased number of drug dealers using international mail for trafficking drugs.

Dealers would often send parcels containing illicit drugs from abroad to innocent people in China, such friends in China who did not know what was inside the parcels, and later retrieve the parcels from them, GACC said in the statement.

People should be cautious when helping others receive parcels sent from abroad, GACC said.

Chinese customs uncovered 506 drug trafficking crimes in 2009, up 33.9 percent from the previous year, and illicit drugs confiscated weighed a total of 2,119.2 km, up 150 percent year-on-year.