North Korea has reportedly stationed military guards around a power generator that belongs to South Korea’s Hyundai Asan at a port within the Mount Geumgang resort.

Sources familiar with North Korean affairs said Wednesday that the guards were stationed at one of the three 17-hundred-kilowatt generators in Goseong port. It is the only one of three generators that is operating.

The sources said North Korean authorities had been blocking 14 employees of the South Korean firm and two Korean-Chinese workers of the generator from entering it. The employees were forced to leave the facility on Tuesday in line with the North’s demand that all personnel of South Korean companies leave Mount Geumgang resort within 72 hours.

Due to the blocked access, Hyundai Asan employees were only able to carry out basic security steps, including locking offices, and were unable to implement special security measures for the generator.

A government official said the North is likely to use South Korean facilities without permission while pursuing its project to develop the resort into an international tourism zone.