Tour operators specialising in travel to North Korea have reported that the Trump administration plans to bar Americans from visiting the country starting next month.

Koryo Tours and Young Pioneer Tours, who both operate in North Korea, have reported that the US plans on barring its citizens from visiting the country.

The ban will be officially announced on 27th July, coinciding with North Korea’s ‘”Victory Day,” and will come into effect exactly one month later.

The Swedish embassy in Pyongyang, which handles consular affairs for the United States in the country, informed the tour operators of the ban.

It is widely assumed that the ban is in response to the detention of US citizens in North Korea and the death of Otto Warmbier, a University of Virginia student from Ohio, who was held for nearly 18 months before being flown home in a coma.

“We have just been informed that the US government will no longer be allowing US citizens to travel to the DPRK (North Korea),” Young Pioneer Tours said in a statement. “It is expected that the ban will come into force within 30 days of July 27th. After the 30 day grace period any US national that travels to North Korea will have their passport invalidated by their government.”

“Any US national that travels to North Korea will have their passport invalidated by their government.”

Earlier this month, North Korea announced it had successfully tested its first intercontinental ballistic missile (ICBM). Some experts say the ICBM could reach as far as Alaska.