MOSCOW, January 17 (RIA Novosti) - Russia's...

The companies did not state the reason for the decision, but company representatives unofficially said the move is connected to a possible terrorist threat.

The cellular operators plan to resume services in the metro from 12 a.m. Thursday if there are no additional recommendations from authorities.

Russia's National Anti-Terrorism Committee, headed by Federal Security Service's (FSB) boss Nikolai Patrushev, said Tuesday the service had obtained a report from foreign sources of a possible terrorist plot to attack ground transport and one of the country's subway systems.

No indication was given as to which country issued the warning.

Russia's international cooperation on anti-terrorism involves contacts with many countries, including the United States.

Federal Bureau of Investigation spokesman Stephen Kodak declined to comment on whether the FBI provided Russian authorities with the warning, saying the bureau never comments on exchanges

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