Beijing ? Chinese and U.S. agents seized more than 300 pounds of cocaine smuggled from Colombia, authorities said Tuesday – a record drug bust for China that underscores how South American narcotics gangs are aggressively moving into Asia.

Nine people were arrested. Chinese television footage showed a locker stacked high with dozens of bricks of smuggled cocaine, some with a yin yang symbol embossed on the solid white blocks.

The suspects include two Colombian citizens arrested in Hong Kong, along with suspects from Hong Kong and mainland China, said Liu Guangping, spokesman for the Customs General Administration of China.

A joint inquiry by the U.S. Drug Enforcement Agency and customs agents in Hong Kong and mainland China uncovered the network of Colombian drug gangs and criminals from Hong Kong and China.