
The blast occurred at about 12.05am (2105 GMT Monday) on Savyolovsky railway station square, according to the ministry’s statement on Telegram.
Savyolovsky station, in northern Moscow, is one of the capital’s main railway hubs.
The attacker approached traffic police officers sitting in their patrol vehicle and then an explosive device detonated, the statement said, adding that the attacker died at the scene.
Authorities gave no immediate details about the explosive or the attacker’s identity.
Russia’s Investigative Committee, which probes major crimes, said it had opened a case of attempted murder of a law enforcement officer and for the illegal possession of explosive devices.