An informed source in Pyongyang told NK News that they heard what seemed to be jet sounds in the early hours Thursday morning, the third time sources reported similar noise late at night in the capital this month.

The source reported hearing the sounds around 12:30 a.m. KST, though the exact number of aircraft was not immediately clear. An informed source also said a North Korean interlocutor told them that the military parade would take place on April 25, the 90th anniversary of the Korean People’s Army. NK News was unable to confirm when exactly the parade will be held.