"We have just been informed that the US government will no longer be allowing US citizens to travel to the DPRK (North Korea). 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," the Young Pioneer Tours (YPT) agency said on its website.
The YPT is the agency hat brought US college student Otto Warmbier to North Korea in 2016, who was sentenced to 15 years of hard labor for trying to steal a propaganda sign from a hotel in Pyongyang.
After 17 months in detention, he was released in a coma in June, evacuated to the United States and died in Ohio a few days after. The US State Department did not comment on the circumstances surrounding Warmbier's death, but condemned North Korea for its actions.