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MOSCOW (Reuters) - Russia's state investigative committee said on Monday it had opened a criminal case over the St Petersburg metro blast on charges of a terrorist act.
The agency, which has sweeping powers, said it had sent a group of investigators to St Petersburg to look into the incident which killed at least nine people.
It said however that while it had opened a case under charges of terrorism, it would consider all other possible causes of the incident.
Reporting by Alexander Winning; writing by Sujata Rao