People walk in Red Square during heavy snowfall in Moscow, January 27, 2019 (Photo:Reuters)

Last week, 55 buildings were evacuated in Russia's second city Saint Petersburg and several other cities like Krasnoyarsk in Siberia and Volgograd in the south were forced to act after receiving similar threats.

Russian media reported some 20,000 people were evacuated in Moscow Tuesday but authorities found nothing. The bomb threat targeted more than 90 buildings in Moscow and over 40 in the region of the capital. The Russian State University of the Humanities in central Moscow was closed for Tuesday due to evacuation.