TEHRAN, Young Journalists Club (YJC) - The measure follows reports that Pyongyang had suspended visits by Chinese tour groups as it prepares to mark the 70th anniversary of the foundation of the Democratic People's Republic of Korea, as the country is officially known.
Koryo Tours, a popular agency among Western tourists seeking to visit the North, said on its website it had been "informed on 13 August by our partners in Pyongyang that they had been instructed from above that all tourist visa applications currently underway are to be frozen".
It was not given a reason for the freeze, the company said, but was told it would apply until the anniversary on September 9.
"This suggests to us that... a higher power in the country is simply pressing pause on tourism until it is clear to them who is coming in such delegations and how many people," it added.
Pyongyang has previously lavishly celebrated the date with military parades or mass games involving thousands of people performing acrobatic choreography in unison, and is expected this time to hold its first mass games for five years.
Speculation has also mounted that the nuclear-armed North could be preparing to mount a parade -- at which it normally shows off some of the weapons that have earned it multiple sets of UN Security Council sanctions.
Chinese President Xi Jinping is speculated to be on the guest list, as officials in the North told South Korean journalists that he was invited to the event.
In his New Year speech in January, leader Kim Jong Un said North Korean people would "greet the 70th founding anniversary of their Republic as a great, auspicious event".