The 2017 Wonsan Air Show scheduled to take place in September has been canceled by the North Korean Preparatory Committee, an official email from organizers seen by NK News revealed on Friday.

The Air Show would have been the second such event and was scheduled to showcase aircraft from North Korea’s domestic airline – Air Koryo – as well as the North Korean military.

While the email does not outline a specific reason for the cancellation, it cites “current geopolitical circumstances,” “uncertainty,” and “recently upgraded travel warnings” by numerous countries regarding visiting North Korea.

The DPRK announcedthe event in March