Secretary of State Rex Tillerson has decided to ban all travel by Americans to North Korea, due to “the serious risk of arrest and long-term detention” by the rogue regime.

“Once in effect, U.S. passports will be invalid for travel to, through and in North Korea, and individuals will be required to obtain a passport with a special validation in order to travel to or within North Korea,” State Department spokeswoman Heather Nauert said Friday.