Southwest Airlines has canceled flights to South Korea, citing the escalation of the Korean military in the country.
The flight from Atlanta to Seoul was due to depart at 2:15 p.m.
ET (1715 GMT), but the airline said that due to heightened security in the region, the flight will not depart until 4:30 p.o.m., according to FlightGlobal.
The company said the flight had been scheduled to depart from Atlanta on Feb. 4, but the trip was cancelled due to the escalating situation.
The Korean Air Lines announced in a tweet on Monday that the flight was cancelled because of “a conflict between the Korean Air Force and South Korean National Security Forces.”
South Korean National Defense Ministry spokesperson Kim Min-seok said the Korean People’s Army is conducting an operation in the North Hamgyong Province and “took the necessary steps” to defend the country from aggression.
Kim said the North Korean military is conducting its own operation in North Hammyong province.
South Korean Defense Minister Han Min-joo said the South Korean government is “ready to take further measures if necessary” to protect its citizens, according to Yonhap News Agency.
The South Korean military said on Sunday it had taken control of a border area near the border with North Korea, South Korea Times reported.
A military source told Yonhap that the North has taken control over the border area along the 2,000-kilometer (1,900-mile) border with South Korea.
It was unclear if the South Korea-based military had carried out any attacks or had retaliated to the North’s moves.
South Korea’s Yonhap news agency quoted an unnamed military source as saying that “the North Korean armed forces have taken control” of the border.
The North has also moved to shut down border crossings between the two Koreas and imposed economic restrictions on the South, according the newspaper.