Earlier, on June 9, a patrol team from the Tra Co Border Guard Station found the three men at an oyster farm of local household.
The men showed valid Chinese passports but did not have visas and they entered Vietnam without completing immigration procedures.
They said that an unknown Vietnamese man used a motorboat to pick them up from another Chinese motorboat in the waters bordering the two countries and brought them into Vietnam.
The patrol team took the three Chinese men to Tra Co Border Guard Station for investigation.
Tra Co Border Guard Station, in coordination with Mong Cai International Border Gate’s Border Guard Station, informed the border management branch in Fangchenggang, China’s Guangxi province on the men and asked the Chinese side to receive them back.