Story highlights US State Department "aware of reports" of citizen being detained

Four Americans are now believed to be detained in North Korea

Seoul, South Korea (CNN) North Korea has detained a US citizen on suspicion of "hostile acts" against the regime, the state-run Korean Central News Agency reported Sunday.

The regime described Kim Hak-song as "a man who was doing business in relation to the operation of Pyongyang University of Science and Technology." KCNA said the American was detained Saturday, but did not release more details on his alleged crime.

In a statement, Pyongyang University of Science and Technology said Kim was doing agricultural development work with the university's agricultural farm.

"The relevant authority is currently carrying out a detailed investigation into the crime of Kim Hak-song," the state-run news agency said.

Read More