Ukrainian authorities say Russian forces are attacking Kostiantynivka with cluster bombs and missiles. Pavlo Kyrylenko, the governor of Donetsk province, said one person was killed and at least three civilians injured after several rounds of Russian shelling on Saturday.

An attack on the town the day before left eight people injured and more than a dozen homes destroyed or damaged. The dams have overwhelmed local firefighters, who are taking great risks putting out fires in buildings and cars, even as shelling continues.

The air is heavy with smoke and the acrid smell of explosives as the firefighters unfold a hose. They smash the windows of the brick house and spray water from the outside.

There are no people inside, but a dog is trapped in a cage in the backyard. A firefighter opens the gate and the dog runs out among the smoke and debris.

The chief of the unit calls on his team to stop what they are doing.

“Attention everyone. Air raid!” he yells.

The fire brigade takes cover behind the house. They sit still as explosions take place a short distance away. One lights a cigarette.

It is unclear whether the blasts are a new wave of attacks or secondary explosions caused by fires in the area. Anyway, the explosions get too close and the leader of the team orders everyone back to the truck.

As they run down the dirt road, another loud explosion shakes the neighborhood, sending a cloud of smoke into the sky not far from the house they just left.

Kyiv Associated Press writer Karl Ritter contributed to this report.

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