U.S. Ambassador to South Korea Harry Harris is confirmed to have attended a U.S.-North Korea meeting held last Sunday at the border village of Panmunjeom.

A diplomatic source said Friday the ambassador was present at the talks which appear to have been a meeting to convey Washington's stance rather than negotiations on denuclearization.

North Korea's Vice Foreign Minister Choe Son-hui, who has led working-level talks with the U.S., is known to have attended the Panmunjeom meeting as a counterpart of Ambassador Harris. 

Observers speculate Harris delivered a message from President Donald Trump or Secretary of State Mike Pompeo. Some say the ambassador may have notified of the U.S. administration's plan to send Pompeo to North Korea and related itinerary in the meeting.