The biggest border crossing between North Korea and China has been closed to tourist groups, as nuclear tensions mounted, but business travel is still allowed says a PTI report.

An official at the Dandong Border Office, who declined to give his name, said: “Travel agencies are not allowed to take tourist groups there, since the North Korean Government is now asking foreign people to leave.”

“As far as I know, business people can enter and leave North Korea freely,” he added.

China is North Korea’s sole major ally and the provider of vast majority of its trade and aid, with most of the business passing through Dandong.

A woman surnamed Wu at a travel agency in the town said municipal authorities have told that because of tensions in Pyongyang, Dandong travel firms would not be able to take tours into North Korea from today.

“It was absolutely North Korea’s (decision) because the travel bureau told us ‘North Korea is now no longer allowing tour groups to be taken in’,” the woman said.