TUMANGANG, NORTH KOREA - AUGUST 19: A Customs officer checks a passenger's mobile device on the train No.100 from Moscow to Pyongyang at Tumangang railway station on August 19, 2015 in Tumangang, North Korea. North and South Korea today came to an agreement to ease tensions following an exchange of artillery fire at the demilitarized border last week. (Photo by Xiaolu Chu/Getty Images)
