North Korea appears to have staged a night-time military parade to mark the 73rd anniversary of the national founding.

The military parade reportedly started at 12 a.m. on Thursday at Kim Il-sung Square in Pyongyang. 

An official from South Korea's Joint Chiefs of Staff said there have been signs that the North carried out the parade and that the South Korean military is closely analyzing those signs. 

Online media outlet NK News quoted multiple sources as saying that they heard military jets flying over the capital city and fireworks started around 1 a.m. Thursday, suggesting the event took place during that time. 

It has not been confirmed yet if leader Kim Jong-un attended the event and what kinds of weapons were displayed. 

North Korea staged a similar nighttime military parade in October last year to mark the anniversary of the founding of the ruling Workers' Party. Another nighttime military parade was held in January after a rare party congress.