There's no indication any Australians have been injured or killed in the deadly subway bombing in the Russian city of St Petersburg, foreign affairs officials say.
Monday's bombing killed 11 people and wounded 45 others while Russian President Vladimir Putin was in St Petersburg, his home town.
"The Australian Embassy in Moscow is in contact with Russian authorities to determine whether any Australians were involved in the explosions on the St Petersburg metro on 3 April," a Department of Foreign Affairs spokesperson told AAP.
"There are currently no indications that Australians were killed or injured in the incident."
Defence Minister Marise Payne condemned the attack.
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"It is an attack on innocent civilians in, as I understand it, a public transport environment and it is simply outrageous," she told ABC radio.
"We are working with our embassy in Moscow to determine in the first instance whether any Australians are likely to have been involved."
Any Australians with concerns for the welfare of family and friends in the region are being encouraged to try and contact them directly.
Prime Minister Malcolm Turnbull sent Australia's thoughts and condolences to the families of victims.
"This is a reminder ... that terrorism is a global threat and all nations need to work together to combat it," he told reporters in Canberra.
"Whatever other differences we may have between nations, we have a common interest in stopping this terrorist menace."
