North Korea has cancelled this year’s Wonsan Air Show, travel agents said on Monday, with reports suggesting tightened travel restrictions by several countries due to nuclear tensions with Pyongyang could be behind the move. The first-ever Wonsan International Friendship Air Festival was held in September last year, attracting hundreds of foreigners as the isolated North showcased a line-up of civilian and military aircraft. The event had been planned to take place every two years, but North Korea said in March the first was so successful that it was bringing forward the second edition. But the gathering, scheduled for late September, was cancelled by the North Korean Preparatory Committee due to “current geopolitical circumstances”, specialist website NK News reported, citing an email from the organisers.