An E-8C Joint STARS ground surveillance aircraft of the U.S. Air Force buzzed the Seoul metropolitan area on Friday to see if North Korea is preparing any intercontinental missile launches.

According to Aircraft Spots, a military aircraft tracker, the E-8C flew from an area south of Seoul to the East Sea. It seems to be one of the two E-8Cs the U.S. deployed at Kadena Air Base in Okinawa, Japan on Oct. 5.