Hanaa Singer, UNICEF representative in Syria, said intense attacks damaged the Bab al-Nairab station, which supplies water to some 250,000 people in the rebel-held east.

Singer said that in retaliation, the Suleiman al-Halabi pumping station, also located in the rebel-held east, was switched off — cutting water to 1.5 million people in government-held western parts of the city.

"Depriving children of water puts them at risk of catastrophic outbreaks of water-borne diseases," Singer warned in her statement, released late Friday.