MOSCOW (AP) — Dozens of landmark buildings and transport hubs in Russia have been evacuated because of fake bomb threats made by unknown telephone callers.

Citing security service officials, Russian media said up to 30,000 people were ordered to leave major buildings in Moscow on Wednesday and reported that about 45,000 people in dozens of cities across Russia had been affected on Monday and Tuesday.

The hoaxers’ targets have included GUM, the flagship department store on Red Square that faces the Kremlin, as well as railway stations, airports, shopping centers, universities, hospitals and hotels.

The identity of those making the calls remains a mystery and Russian officials have not offered any explanation for the threats.

President Vladimir Putin’s spokesman, Dmitry Peskov, declined to comment Wednesday when asked about the anonymous phone calls.

Passengers wait in front of the closed doors of the Yaroslavsky railway terminal in Moscow on September 13, 2017.
More than 15,000 people were evacuated Wednesday from several shopping centres, universities and train stations in Moscow after a series of bomb threats, Russian media reported. (MAXIM ZMEYEV/AFP/Getty Images)