North Korean artillery rolls past during a parade for the 70th anniversary of North Korea's founding day in Pyongyang, North Korea, Sunday, Sept. 9, 2018. Yonhap

Officials and other guests have been invited to "celebrations" arranged to mark the ongoing party congress, Pyongyang's media reported Tuesday, raising the possibility that Pyongyang might be preparing to hold a military parade.

On Monday, Seoul's military officials said signs were detected that the North carried out a military parade in central Pyongyang Sunday night in time for the eighth congress of the ruling Workers' Party, which has been under way since its opening last week.

State media, however, have not reported on such an event yet, spawning speculation that it might have been a rehearsal and a military parade could take place in the days to come. North Korea has usually broadcast live or aired recorded footage of military parades later.

North Korean intercontinental ballistic missile "Pukguksong-4A" is being displayed during a North Korean military parade held in Pyongyang on Oct. 10, 2020 to celebrate the 75th anniversary of foundation of the country's ruling Workers' Party. Yonhap