South Korean workers at an inter-Korean industrial complex in North Korea have returned to work after being sent home over the weekend.

A Unification Ministry official says the 40 civilian workers left Seoul Monday and returned to the Gaesong Industrial Complex management office.

Separately, an inter-Korean cargo train running between Dorasan Station and North Korea' s Bongdong Station left on schedule at nine a.m. Monday. It was set to return to the South by 2:20 p.m.

The official said there was no unusual response from the North on the train's operation.