An explosive device went off under a train in the Russian North Caucasus Republic of Dagestan on Monday, a local emergencies spokesman said, according to RIA Novosti.
Rail monopoly Russian Railways said no one was injured in the explosion.
The train, which was en route West Siberia`s Tyumen to Azerbaijan`s capital, Baku, did not derail, the emergencies official said.
The attack comes days after a bomb blast caused the derailment of the Nevsky Express from Moscow to St. Petersburg. Twenty-five people died in Friday`s accident, with six still unaccounted for and 90 still in hospitals, 21 in critical condition.
Violence is common in the southern Russian republic, which neighbors Chechnya, with officials often targeted. A local police spokesman said that the head of Dagestan`s Magaramkent District, Abrek Gadzhiyev, was killed on Monday morning.
Gadzhiyev`s car came under fire in Makhachkala, Dagestan`s capital.
"Gadzhiyev died of wounds, and his injured driver has been hospitalized," the police official said. The driver underwent surgery and remains in serious condition.