Russia's Ministry of the Interior and the USA's Federal Bureau of Investigation will maintain round-the-clock contact.
The decision was taken as Interior Minister Boris Gryzlov and Robert Muller, FBI Director, had a telephone conversation, 9 pm, Moscow time, Friday night, Interior Ministry PR said to RIA Novosti.
The FBI chief expressed indignation with terrorism and support to Russian law-enforcement agencies.
He offered every assistance to Russia. In particular, anti-terrorist and technical experts may be dispatched to Moscow in its hostage-taking plight.