Aleppo War: An all out war between Regime and Rebels for control of Aleppo
Fears are growing for trapped civilians ahead of what is expected to be a major battle for Aleppo, Syria's second city and a focal point of the country's five-year civil war.
Rebel factions and President Bashar al-Assad's regime have sent hundreds of reinforcements to Aleppo in anticipation of the fighting, after opposition forces broke a government siege at the weekend and vowed to capture the entire city.
The UN's top humanitarian official in Syria, Yacoub El Hillo, and regional coordinator Kevin Kennedy said in a statement late on Monday that medical and food stocks "are running dangerously low" in Aleppo.
They appealed for a full-fledged ceasefire or weekly 48-hour "humanitarian pauses" to reach those in need.
UNICEF said children and families in Aleppo were facing "a catastrophic situation", with up to two million people without running water for four days after fighting damaged electricity networks needed to pump supplies.
"These cuts are coming amid a heatwave, putting children at a grave risk of waterborne diseases," Hanaa Singer, UNICEF's representative in Syria, said in a statement.