The attack has left at least 17 adult staff injured, according to a local official in the southeastern town of Mauriopol, which has faced a steady assault by the Russian military.

The UN and the World Health Organization have called for an "immediate halt to attacks on health care, hospitals, health care workers, ambulances," Dujarric said during his daily press conference.

"So far there are 17 wounded personnel of the hospital," Pavlo Kyrylenko, the head of the southeastern Donetsk region, said in a video posted on Facebook. He added that "so far no kids were wounded" and there have been no deaths.