The US Central Intelligence Agency (CIA) ran a previously undisclosed office in Seoul until last year, legal sources said on Sunday.

The existence of the office, which was used to collect open-source intelligence on South Korea as part of the CIA’s Open Source Enterprise, became known after three former employees sued the US government for firing them, Yonhap News Agency quoted the sources as saying.

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The plaintiffs, all South Koreans, were hired between 2005 and 2009 and laid off around February and March of last year.

They claimed in their lawsuit that their dismissal was unfair because there were no urgent business grounds for it.

The Seoul Central District Court dismissed the case, however, saying that the decision was a sovereign action by the US and fell outside the jurisdiction of South Korea’s courts, according to the sources.

The CIA reportedly closed all of its overseas open-source intelligence offices in June last year.