It said two Russian rockets had struck a station in the city of Kramatorsk which is used for the evacuation of civilians from areas under bombardment by Russian forces.
“Two rockets hit Kramatorsk railway station,” Ukrainian Railways said in a statement.
It later added: “According to operational data, more than 30 people were killed and more than 100 were wounded in the rocket attack on Kramatorsk railway station.”
The Standard could not verify the information.
Russia did not immediately comment on the reports of the attack and the casualty toll. Moscow has denied targeting civilians since invading Ukraine on February 24.
Three trains carrying evacuees were blocked in the same region of Ukraine on Thursday after an air strike on the line, according to the head of Ukrainian Railways.
Ukrainian officials say Russian forces have been regrouping for a new offensive, and that Moscow plans to seize as much territory as it can in the eastern part of Ukraine known as Donbas bordering Russia.
Local authorities in some areas have been urging civilians to leave the while it is still possible and relatively safe to do so.