Tightening immigration is part of efforts to curb the spread of the epidemic which has caused 45 coronavirus-infected cases in Vietnam.

Vietnam remains concerned over coronavirus import after it has contained the virus domestically.

Foreign visitors can stay or leave the country from now throughout June 30 without doing any paperwork.

Shortly before Vietnam detected locally infected coronavirus cases in Danang, police found dozens of illegal Chinese immigrants in the city.

Since the start of this year, illegal Chinese immigrants have been found in 27 out of 63 cities and provinces in Vietnam.