South Korea's unification ministry sent a warning to North Korea:
Factories, machines and facilities at the inter-Korean Kaesong Industrial Complex belong to South Korean firms and therefore North Korea's use of them violates the property rights of South Korean firms.
The message comes in response to recent reports from Pyongyang's propaganda outlets indicating that the operation at the joint industrial zone has restarted.
The unification ministry says movement specific enough to confirm the resumption of operations at the complex couldn't be seen as of yet but street lights and bus movement could be spotted.
Seoul says it will cooperate with related ministries to investigate relevant facts.
And if South Korean firms that ran business there request a visit to the complex to check their assets, the government will consider an approval though a visit can only be achieved if the North agrees as well.
The complex, located near the inter-Korean border, hosted 124 South Korean firms from 2004, employing some 54-thousand North Korean workers to produce labor-intensive goods, such as clothes and utensils.
But it was shut down by Seoul in February 2016, after Pyongyang conducted nuclear and missile tests.
Oh Jung-hee, Arirang News.