"According to preliminary information, three people were killed after a truck exploded on the Crimean bridge," Russia's investigative committee said in a statement, Report informs, citing The Moscow Times.
It said they were likely to be "passengers of a car near the truck that exploded."
The statement said the bodies of two victims — "a man and a woman" — had been lifted out of the water.
It said their identities were being confirmed, giving no details on the third body.
Investigators said a resident of Russia's southern Krasnodar region, which it did not name, was the car's owner.
"Investigative actions have been launched at his place of residence," the investigators said.