A senior South Korean security official said on Tuesday that information contained in purportedly leaked U.S. confidential documents that appeared to be based on internal discussions among top South Korean officials is "untrue" and "altered."

Deputy National Security Adviser Kim Tae-hyo spoke as he departed for Washington ahead of President Yoon Suk-yeol's state visit to the U.S. on April 26.

"The two countries have a same assessment that much of the information disclosed is altered," Kim told reporters, adding that the report on South Korea is "untrue."