This is a breaking news story. Please check back for updates. (Last updated at 9:07 a.m. on July 19 with U.S. official’s statement, details from ABC News report)

A U.S. citizen crossed the Military Demarcation Line (MDL) into North Korea during a tour of the Joint Security Area (JSA) on Tuesday, according to the U.N. Command.

The American is believed to be in DPRK custody and has not yet returned to South Korea, the UNC said.

“A U.S. national on a JSA orientation tour crossed, without authorization, the Military Demarcation Line into the Democratic People’s Republic of Korea (DPRK),” the