South Korea's Defense Ministry "intentionally dropped" mentioning that four more launchers had been deployed for the controversial U.S. THAAD anti-missile system in a report to President Moon Jae-in's top aides, his office said on Wednesday.

Moon has ordered a probe at the ministry of defense, saying it was "very shocking" the launchers had been brought in without being reported to the new government or to the public, presidential Blue House spokesman Yoon Young-chan said on Tuesday.

The Defense Ministry intentionally omitted details about the Terminal High Altitude Area Defense (THAAD) system battery (THAAD) in a report last week, when the new government was preparing for Moon's summit with U.S. President Donald Trump next month, Yoon told a briefing.