UPDATE AT 1700 KST: This article has been updated to include the South Korean government’s response to the news.

A planned meeting between high-level North Korean official Kim Yong Chol and U.S. Secretary of State Mike Pompeo has been postponed, the State Department announced on Wednesday.

The meeting, scheduled to take place on Thursday in New York, was set to be closely watched, with its outcome expected to be a crucial factor in whether or not this year’s diplomatic rapprochement between the United States and North Korea continues.

“Secretary of State Michael R. Pompeo’s meeting with officials from the Democratic