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North Korea says it detained another U.S. citizen over alleged hostile acts

American detained in North Korea
American detained in North Korea 02:17

SEOUL, South Korea -- North Korea on Sunday said it detained another American citizen over unspecified hostile acts against the country. 

North Korea's official Korean Central News Agency said Kim Hak Song, an employee of the Pyongyang University of Science and Technology, was detained Saturday. 

North Korea threat 08:46

It follows another recent detention. North Korea on Wednesday announced the detention of an accounting instructor at the same university, Kim Sang Dok, for "acts of hostility aimed at overthrowing the country." Park Chan-mo, the chancellor of the Pyongyang University of Science and Technology, had said last month that Kim was detained by officials as he was trying to leave the country from Pyongyang's international airport. 

The KCNA didn't say whether the two cases are connected. 

"A relevant institution is now conducting detailed investigation into his crimes," the KCNA said about Kim Hak Song. 

If confirmed, this would bring the number of Americans in North Korean custody to four.  

In Washington, the State Department said it was aware of the report of the new detention and that "the security of U.S. citizens is one of the department's highest priorities."

Pyongyang University of Science and Technology told CBS News it can't comment yet, but will release a statement.

The Swedish Embassy in Pyongyang has not returned phone calls or responded to emails. The embassy looks after consular affairs for the United States in North Korea because the two countries do not have diplomatic relations. 

North Korea detains American college student 00:56

The other Americans detained in North Korea are Otto Warmbier, who is currently serving a 15-year prison term with hard labor for alleged anti-state acts, and Kim Dong Chul, who is serving a 10-year term with hard labor for alleged espionage.

Washington, Seoul and others often accuse North Korea of using foreign detainees to wrest diplomatic concessions, which in recent years have involved high-profile American missions sent to secure the release of the Americans.

North Korea's latest announcement comes amid tensions over fears that Pyongyang is preparing another round of nuclear or missile tests and comments. U.S. President Donald Trump has further spiked animosity by saying he isn't ruling out military action against the North, although Trump has also said he would be willing to talk with North Korean leader Kim Jong Un under the right circumstances.

North Korea on Friday accused the U.S. and South Korean spy agencies of an unsuccessful assassination attempt on leader Kim Jong Un involving biochemical weapons. 

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