A missile which killed at least 40 civilians including 10 children when it struck at a railway station had the words "for children" written on its side in Russian, it has emerged.
Following the savage attack, which happened at Kramatorsk as hundreds of families queued to evacuate, images emerged appearing to show the lettering on the side of a Tochka U missile.
The bombing has been described as "evil beyond limits" by Ukraine's President, as the list of war crimes Vladimir Putin's forces are accused of continues to grow.
More than 85 people were injured in the attack, many of them seriously, authorities said.
Sharing a picture of the missile, UK ambassador to Ukraine Melinda Simmons wrote: "Marking a missile “for children” and then aiming it at fleeing civilians inc children at #Kramatorsk, is an unspeakably brutal Russian depravity."
Lithuanian former foreign minister Linas Linkevicius posted on Twitter : "Another horrific war crime.
" Russia ’s missile with ‘for children’ written on it hit #Kramatorsk train station killing at least 39 with children among them.
"Madness and cynicism have no borders. They are really convinced that no one will judge them. World must make them wrong."
Ukrainian President Volodymyr Zelensky said the attack demonstrated "evil beyond limits" by Russian invaders.
Mr Zelensky said: "The inhuman Russians are not changing their methods.
"Without the strength or courage to stand up to us on the battlefield, they are cynically destroying the civilian population.
"This is an evil without limits. And if it is not punished, then it will never stop."
The Governor of Ukraine's eastern Donetsk region accused Russian forces of firing cluster munitions in the sickening bombing.
Governor Pavlo Kyrylenko said: "They wanted to sow panic and fear, they wanted to take as many civilians as possible."
He said that thousands of people had been at the station at the moment when the rocket struck.
Mr Kyrylenko claimed the rocket that struck the station contained banned cluster munitions, which explode in mid-air, spraying small lethal bomblets over a wider area.
UK Defence Secretary Ben Wallace today said Russia may have committed another war crime by targeting civilians with precision missiles.
Meanwhile Foreign Secretary Liz Truss said she was "appalled" by the reports, adding: "The targeting of civilians is a war crime. We will hold Russia and Putin to account."
Mr Wallace, visiting Romania for talks, said the strike was a repeat of the Russian president and his generals targeting civilians.
Speaking at a press conference in Constanta, he said: "Not very far away this morning in a place called Kramatorsk, what appear to be Russian missiles struck civilian people queuing for trains to seek a safer place from the war.
"The striking of civilians and critical infrastructure is a war crime. These were precision missiles aimed at people trying to seek humanitarian shelter."
The U.S. embassy in Ukraine described the attack as "one more atrocity" committed by Russian troops.
On Twitter it said: "The Russian missile attack on the Kramatorsk railway station, a hub for civilian evacuations, which left dozens of people killed and more than 100 injured, is one more atrocity committed by Russia in Ukraine.
"The world will hold (Russian President Vladimir) Putin to account."
Russia denies targeting civilians and its defence ministry has said its forces were not behind the Kramatorsk attack.
