(FILES) This file photo taken on May 10, 2016 shows North Korean leader Kim Jong-Un waving from a balcony of the Grand People's Study House to participants of a military parade and mass rally on Kim Il-Sung square in Pyongyang. North Korea launched an apparent missile into the Sea of Japan on August 29, 2017, South Korea's military said. The North fired the "unidentified projectile" from Pyongyang at around 5:57 am (2057 GMT), according to the Joint Chiefs of Staff. / AFP PHOTO / Ed Jones
Tokyo reported that the rocket launched by Pyongyang flew over its airspace and warned its citizens to seek refuge

For this reason, the authorities issued an emergency alert and warned their citizens to seek refuge immediately.