Around 44 were killed in bombardment of Syria's Eastern Ghouta enclave on Monday. Earlier in the day, The United States condemned Syria's "brutal" Russian-backed assault on the Eastern Ghouta rebel enclave that has reportedly left hundreds of civilians dead.
The White House also called on pro-regime forces to "immediately cease targeting medical infrastructure and civilians" in Eastern Ghouta.
Assad's forces have seized over a quarter of the enclave on Damascus's eastern edges after two weeks of devastating bombardment, according to the Syrian Observatory for Human Rights, a Britain-based monitor.
The advance on the back of air strikes, artillery fire and rocket attacks that are reported to have killed more than 650 civilians, sent hundreds into the flight to western parts of the enclave.