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STORY: This is a story about a Ukrainian family and the mission to reunite them.

A mother, eight months pregnant, rescued from Bakhmut - a city under siege. But her six-year-old daughter, left behind with her grandparents and great grandmother.

Reuters is there as police go looking for them two days later. The evacuation team calls itself the "White Angels."

There's the girl, Arina.

Police are asking who she's living with. She says, her grandparents.

Are there any other children she can play with? No.

This mission is risky. That boom was an explosion. It's time to go.

And she's starting to cry.

She needs a little coaxing, too. There's more explosions as she's given a helmet.

What about great-granny, she asks. She's coming too. The others are staying behind. It's difficult.

She has child-sized body armor on. It says "children" on it. This is a reality of the war.

And now the moment. There's mom.

We're now in the city of Sloviansk. Mom, Halyna Danylchenko, is thanking the police. Arina says a shell exploded in their yard. Her mother was so worried.

Pavlo Dyachenko is a communications officer with the Bakhmut police department, and a White Angels member.

"Around 200 children are still in Bakhmut, according to our preliminary count. We're meeting the families that are still there and talk to them, trying to convince them to agree to be evacuated, either the whole family or the children. Because children must live in a peaceful environment."

Millions of people like this have been displaced in Ukraine.

The fighting for Bakhmut is among the worst.