North Korea has cancelled the Pyongyang marathon for unspecified reasons, a tour agency linked to the event has said.

British-owned Koryo Tours, which describes itself as the official partner of the marathon, said on Monday that it had received notice of the cancellation from North Korea's athletics association.

A message it attributed to the association said the marathon was being cancelled "due to some reasons".

The annual event was established in 1981 to celebrate the birth of North Korea's founding leader Kim Il Sung. The 2026 race was set to take place on 5 April.

The message, purportedly from the North Korea athletics association's general secretary, thanked "all the Elite Marathoners and Amateur Runners of the world who are interested in Pyongyang International Marathon".

The message gave no further explanation on what the reasons for the cancellation were.

Koryo Tours said it understood the decision was final and had been taken "at a level above the organisers of the event itself".

It said it would be seeking clarification on the circumstances surrounding the decision.

The tour company added that neither organisers nor event partners were involved in making the decision, and said it recognised "this announcement will be disappointing to many runners who had already registered or were planning to participate".

Koryo Tours, based in Beijing, China, offers several marathon packages to foreigners, departing from Beijing, Shanghai and Shenyang.

Packages start from €2,190 ($2,529; £1,894) for 2.5 nights in the North Korean capital, Pyongyang, including a marathon place and "highlights" of the capital and tickets were sold out this year, according to the agency's website.

It said all deposits paid will be returned and runners have the option to retain their deposit for a future event or North Korea tour.

A date for the 2027 marathon has not yet been set.

The event had only returned last year after it was suspended for five consecutive years due to the Covid pandemic.

It is open to both amateur and some professional athletes and offers several race distances - 5km (3.1 miles), 10km (6.2 miles), half marathon (21.1km; 13.1 miles) or full marathon (42.2km; 26.2 miles).