Staffan de Mistura held talks with Walid al-Moualem in Damascus and was due to meet him again later in the day, spokesman Ahmad Fawzi told a news briefing in Geneva, saying: "We are witnessing a degradation on the ground that cannot wait."

UN human rights spokesman Rupert Colville condemned the deadly air strikes on hospitals and schools in northern Syria, saying, "Clearly Syrian and Russian planes are very active in this area, they should know who is responsible ...”

"If it was deliberate, intentional targeting of those facilities, it could amount to a war crime," Colville said.

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