NANNING, Jan. 21 -- Chinese police handed over a suspected drug trafficker to Vietnam on Thursday as part of anti-drug cooperation between the two countries, local authorities said.

Dang Chau (transliteration), a major suspect wanted by Vietnamese police in relation to a July 2015 case in which 171.5 kg of heroin and two guns were seized, was handed over at Youyiguan border gate in Pingxiang City in south China's Guangxi Zhuang Autonomous Region.

Dang was caught by police in Guangxi on Nov. 16.

China and Vietnam began a joint two-month campaign on Sept. 8, 2015 during which 3,256 alleged drug traffickers were detained and 3,912 kg of drugs seized.

Police in Guangxi and Yunnan Province, which borders Vietnam, have established border liaison offices in several neighboring Vietnamese provinces since 2000, improving cross-border law enforcement cooperation.