Russian authorities accidentally revealed the addresses of the country’s secret military buildings, institutions, and spy homes, in Moscow and in St. Petersburg, an investigative site found.

The Dossier Center, a project launched by Russian opposition figure Mikhail Khodorkovsky, found the addresses listed in a 434-page document titled “Special Group”, which was published on the Moscow City Hall website. The document listed properties where there must be “no blackouts.”

The list reportedly included a range of top-secret government facilities, homes belonging to GRU (the Main Directorate of the General Staff of the Armed Forces of the Russian Federation) officers and President Vladimir Putin’s secret service, an ammunition depot, and more.

The document was signed by Vyacheslav Torsunov, the head of the housing and communal services department, and Andrey Kovalev, the director of Mosenergosbyt, which sells electric energy to subscribers in the Moscow region. It was approved by the Mayor of Moscow Sergey Sobyanin.