South Korea’s Defence 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 defense ministry, 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 Defence Ministry intentionally omitted details about the Terminal High Altitude Area Defense (THAAD) system battery 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.

“The Blue House has confirmed that the Defense Ministry has intentionally dropped the introduction of four more launchers in its report,” Yoon said.

Moon took office on May 10 without a transition period because a snap presidential election was held just two months after his predecessor, Park Geun-hye, was ousted in a corruption scandal. Moon inherited his defense minister along with the rest of his cabinet from the previous administration.

The THAAD battery was initially deployed in March in the southeastern region of Seongju with just two of its maximum load of six launchers to counter a growing North Korean missile threat.

An earlier version of the defense ministry report specified the total number of launchers being prepared for deployment and the name of the U.S. military base where the four were being kept, but the reference was removed in the final version delivered to the Blue House, Yoon said.

The Pentagon said it had been “very transparent” with South Korea’s government about THAAD deployment.

US Missile Defense Test

During his successful presidential campaign, Moon called for a parliamentary review of the THAAD system, the deployment of which has infuriated China, North Korea’s lone major ally. Moon had also called for more engagement and dialogue with Pyongyang.

Asked about South Korea’s Defense Ministry dropping mention of the four additional launchers, Chinese Foreign Ministry spokeswoman Hua Chunying expressed “serious concern”, and reiterated a call for THAAD to be withdrawn.

North Korea has conducted three ballistic missile tests since Moon took office, maintaining its accelerated pace of missile and nuclear-related activities since the beginning of last year in defiance of U.N. sanctions.

In Washington, the U.S. military said on Tuesday it had staged a successful, first-ever missile defense test involving a simulated attack by an intercontinental ballistic missile.

“The intercept of a complex, threat-representative ICBM target is an incredible accomplishment … a critical milestone for this program,” Vice Admiral Jim Syring, the director of the Missile Defence Agency, said in a statement.