Drone hits a building in downtown Moscow

Russian officials have accused Ukraine of threatening attacks on buildings in Moscow, causing explosions that have been heard in the Russian capital's business area.

The town's mayor, Sergei Sobyan, has said the air defence has dropped fears, but its remains have fallen at the Expo Centre in the city.

The Expo Centre is the vast space used for conferences and conventions, and it's less than five kilometers from the Kremlin.

This is just one of the attacks that have been recorded in Moscow last week.

Unverified social networking images have seen gray smoke rising into the sky.

Ukraine has not commented on the Russian charge, but officials in Kiev never accept the launch of targeted attacks on the Russian capital.

The Russian Defence Ministry has said that following the activism of air systems for protection, fears have “changed direction”, falling into non-inhabitable building in the area where several government buildings are located.

According to her, there are no victim reports.

Russian News Agency T The ASS, has said that the Vukovo airport in Moscow has been provisionally closed, after the accident and later opened again. / REL