A National Defense Commission building under construction in Pyongyang collapsed in October and killed some 80 people, the Japan Times reported on Tuesday.

The Japan Times report, which could not be corroborated, cited information from an unnamed South Korean government official who reportedly received news about the collapse from an anonymous North Korean source.

The report said that North Korean authorities spent two days cleaning up the wreckage and blocked all entrances into the site to prevent the incident from being picked up by orbiting satellites.

No information was provided about where and from when the building was being built