MOSCOW - A bomb tore through the lobby of a luxury apartment block in Moscow on Monday, killing at least one person and injuring four others, Russian state media reported, citing emergency services.

The bomb detonated just as a man with bodyguards entered the lobby of the "Scarlet Sails" complex on the banks of the Moskva River just 12 km (7 miles) from the Kremlin, according to Russian media.

State news agency TASS cited law enforcement as calling the blast an "assassination". It was not immediately clear who the target had been, but the agency said that among the injured were bodyguards of the dead man.

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Baza, a Telegram channel with contacts in Russia's security services, published video showing major damage to the lobby of the building.

Also on Monday, temporary restrictions on the arrival and departure of aircraft were imposed at the Russian airports of Astrakhan, Kazan, Ulyanovsk, Nizhnekamsk, and Saratov, authorities said.

The temporary measures introduced early Monday morning are "to ensure the safety of civil aircraft operations," Artem Korenyako, a representative of the Russian Federal Air Transport Agency, said in a Telegram post.

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Korenyako emphasized that "aircraft crews, air traffic controllers, and airport services are taking all necessary measures to ensure flight safety, which remains the top priority."