The US military says it has moved 100 wooden coffins to the inter-Korean border to prepare for North Korea's returning the remains of American soldiers who have been missing since the 1950-53 Korean War.
US Forces Korea spokesman Colonel Chad Carroll also said 158 metal transfer cases were sent to a US air base near Seoul, South Korea's capital, and would be used to send the remains home.
North Korea agreed to return US war remains during the June 12 summit between North Korean leader Kim Jong-un and President Donald Trump.
The US military preparations suggest that the repatriation of war remains could be imminent, but it remains unclear when and how it would occur.
Earlier on Saturday (local time), Colonel Carroll denied a report by South Korea's Yonhap news agency that US military vehicles carrying more than 200 caskets were planning to cross into North Korea on Saturday. He said plans for the repatriation were "still preliminary".