Investigators in Russia say there were similarities between the bombs used in two separate suicide blasts in the southern city of Volgograd, suggesting the attacks were linked.
Two bombings over the last two days, one at the city's central railway station and another on a trolleybus, killed dozens of people and raised anxieties about the safety of the Winter Olympics being hosted by Russia in a few weeks.
In response to concerns that Islamist militants may be preparing attacks aimed at disrupting the Games in Sochi in February, the United States has offered closer cooperation with Russia on security.
One militant group had issued explicit direct threats to disrupt the Olympics, a US state department official said.
At least 14 people died when a bomb ripped through a trolley bus in Volgograd in the morning rush hour with investigators saying a male suicide bomber was responsible.
A day earlier a similar attack at the main train station killed at least 17 people.
No-one has claimed responsibility, but suspicion has fallen on Islamist insurgents from the North Caucasus region.
US security officials said the government was not surprised by the Volgograd bombings and had anticipated such attacks might well occur in the run-up to the Games.
Caitlin Hayden, a spokeswoman for the National Security Council, condemned the attacks.
She added that the US government had "offered our full support to the Russian government in security preparations for the Sochi Olympic Games, and we would welcome the opportunity for closer cooperation for the safety of the athletes, spectators, and other participants."
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