The missile engine test site that President Donald Trump said North Korean leader Kim Jong Un had committed to destroy is a major facility in the western part of the country that has been used for testing engines for long-range missiles, according to a U.S. official.

Trump told reporters after their June 12 summit that Kim had pledged to dismantle one of his missile installations, which would be North Korea's most concrete concession at the landmark meeting in Singapore. But the president at the time did not name the site.

A U.S. official on Wednesday identified it as the Sohae Satellite Launching Ground, saying North Korea "has used this site to test liquid-propellant engines for its long-range ballistic missiles." Pyongyang has said its missiles can reach the United States.