A blast has rocked a building of Russian Aerospace Forces Academy in St. Petersburg, local emergency services said as cited by RIA Novosti news agency, ONA reports.
At least four people have been injured, it is reported.
The explosion inside an office building of the academy happened on Tuesday afternoon, Russian media reported. The cause of the blast was not immediately clear.
The institution, named after Russian aviation pioneer Alexander Mozhaysky, is a flagship educational institution which commissions officers for the Air Force and other branches of the Russian Armed Forces.