An unidentified armed group in a boat broke into a compound operated by Hyundai Heavy Industries Monday afternoon at Brass Island in the Nigerian state of Bayelsa, abducted the four and two Nigerian colleagues, the Yonhap news agency reported. One Nigerian was ordered off the boat and returned to the construction site, a South Korean foreign ministry official said.
"No contact has been made yet from the kidnappers. We are closely cooperating with local police," the unnamed official said.
Armed insurgents have kidnapped foreigners for ransom in the past, the Yonhap reported, citing incidents involving South Korean workers in Nigeria in 2007 and in April 2010. In both cases, it said, the victims were freed after several days.