No Australians are believed to have been caught up in a deadly metro blast in Russia, which has claimed 11 lives.
Police are searching for two people believed to be behind the bombing of a train and station in St Petersburg.
Authorities are treating it as a terror attack and say the explosives were filled with ball bearings to maximise serious injury and death.
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Dozens of people were also injured in the explosions between Sennaya Square and Technology Institute.
Citing law enforcement officials, Interfax said a suicide bomber was responsible for the blast.
The suspected bomber was a 23-year-old from central Asia who had links to radical Islamists, it added.
Following the blast, a second explosive device was found and deactivated at nearby Vosstaniya Square station.
Authorities now suspect they might be looking for a second person.