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Russian President Vladimir Putin has accused Ukraine of attacking the bridge to Russian-annexed Crimea, saying that it was an "act of terrorism".
President Putin said Ukraine's intelligence forces had aimed to destroy a critically important piece of Russia's civil infrastructure.
He was speaking at a meeting with the head of the Investigative Committee of Russia, Alexander Bastrykin.
Officials say three people were killed in the blast on the bridge.
The victims were in a nearby car when a lorry blew up, Russian officials say.
The rail and road crossing was opened in 2018 and is a key supply route for Russia's invasion of Ukraine.
Mr Bastrykin said that citizens of Russia and some foreign states had aided preparations for the attack.
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