They were shooting civilians, says Ukrainian who fled to Poland for safety

A family fleeing from Ukraine wait for the train at a border crossing station in Poland (Visar Kryeziu/AP)

As more than two million refugees from Ukraine begin to scatter throughout Europe and beyond, some are carrying valuable witness evidence to build a case for war crimes.

More and more, the people who are turning up at border crossings are survivors who have fled some of the cities hardest hit by Russian forces.