A video obtained by Channel 4 news appears to show the moment al-Quds hospital in the Syrian city of Aleppo was destroyed in an airstrike, killing 55 civilians and wounding many more.

The hospital, which was supported by Doctors Without Borders, was bombed on Thursday, as a fragile ceasefire crumbled and the city erupted in a new wave of violence that has killed at least 250 people over the past nine days. The US and others have pointed the finger of blame at the Syrian government for the attack.

Business Insider cannot independently verify the authenticity of the video. But it purports to show the final moments of Dr. Mohammad Moaz, the hospital's only pediatrician, as he leaves the facility's intensive-care unit.

The man shown leaving the unit does appear to be Dr. Moaz, whose photo was released on Facebook by the hospital's director in a tribute to the 36-year-old pediatrician after he was killed.

The new government offensive on Aleppo, believed to have been months in the making, has resulted in a "catastrophic deterioration" of the city over the past three days, said Jan Egeland, the chairman of the UN humanitarian task force for Syria.

US Secretary of State John Kerry will travel to Geneva on Sunday to discuss the war's escalation with his Saudi and Jordanian counterparts. He will also meet with the UN's envoy to Syria, Staffan de Mistura, in an attempt to get the two-month-old cessation-of-hostilities agreement back on track.