The prosecutor's office said it had sent its representatives to the presidential residence to secure evidence of the alleged crime, which might involve top governmental officials, and were mainly targeting the office of special inspection, the Yonhap News Agency reported.
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The Blue House later confirmed this information.
"Prosecutors and investigators from the Seoul Eastern District Prosecutors' Office executed a search warrant today in relation to the complaint from the Liberty Korea Party (LKP)… Cheong Wa Dae [the Blue House] fully cooperated under related procedures," a press secretary of President Moon Jae-in said, as quoted by Yonhap.
The press secretary added that the prosecutors were provided with all requested documentation but were not allowed to enter the residence.
The Blue House spokesman further clarified that desktop computers were among the materials handed over to the prosecutors.
According to the agency, the accusations are based on a confession from a prosecution office inspector, Kim Tae-woo, who said he had illegally monitored civilians, including media employees and former bureaucrats while working for the Blue House.
The presidential office responded by denying the allegations and accusing Kim of leaking classified information and being involved in illegal surveillance activities, despite warnings from his supervisor.