Photo from Oleksiy Matsuka, facebook.com

The tragedy occurred when militants were attempting to carry out an artillery strike on a checkpoint of the ATO forces near Volnovakha, Abroskin wrote.

"Half an hour ago Russian-backed insurgents fired artillery at a checkpoint of the Ukrainian armed forces near Volnovakha from Dokuchaevsk," he said.

"They made a direct hit on a passenger bus. As of now, ten people have been killed, and another 13 injured. The information has to be confirmed," Abroskin said.

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"An investigative group of the Interior Ministry in Donetsk region is working at the scene now," he added.

Photo from twitter.com