After reports of various bomb threats, over 10,000 people were evacuated across the Moscow city in Russian Federation on Wednesday.
TASS reported that the Metropolis, Afimoll and Gorod shopping centres in Moscow had bomb scares along with the Leningrad, Yaroslavl and Kazan stations.
Terrorists have earlier rocked Moscow on two occasions.
At least five cities were targeted by bomb scares in the Russian Far East, Interfax reports.
"It seems like telephone terrorism and nothing else, but all the calls should be checked up", he said.
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Many were city halls, schools and other official buildings, Bloomberg reported, citing local news reports. Kremlin spokesman Dmitry Peskov referred questions on the issue to the security services.
The First Moscow State Medical University and Moscow State Institute of International Relations were also placed in lockdown as the authorities went into operation. Three shopping malls in Moscow also were cleared after calls reporting bombs, Tass reported.
The Russian capital's three largest train stations, three universities, and more than a dozen shopping centres have been evacuated as authorities investigate.
The anonymous calls came from Internet dialling systems and could not be easily traced, official news agencies reported. Social media accounts show bemused crowds milling passively outside evacuated buildings, and there have been no reports of disturbances of public order. Emergency services said that police units including explosives specialists and officers with sniffer dogs are examining the buildings.