Beirut (AFP)

Syrian government aircraft bombed a rebel-held district that is the capital's main water source on Friday as the rival sides traded blame over a cut to mains supplies, a monitor said.

Damascus has been without water from Wadi Barada, a once popular hill station northwest of the capital, since December 22, leaving some 5.5 million people thirsty.

The United Nations warned on Thursday that sabotaging water supplies is a war crime.

Government aircraft dropped at least 10 barrel bombs, crude munitions notorious for the indiscriminate casualties they cause, the Syrian Observatory for Human Rights said.

A child was killed as clashes resumed in the area between pro-government forces and rebel fighters led by the jihadist Fateh al-Sham Front.

East of the capital, clashes broke out in the Marj district despite a ceasefire in force since December 30. Three people were killed, one of them a child.

In Damascus, there were a number of casualties from rebel rocket fire.

Fateh al-Sham, formerly known as Al-Nusra Front, was Al-Qaeda's Syrian affiliate and remains blacklisted as a terror group by the United Nations and Western governments.

Along with its jihadist rival, the Islamic State group, it is not party to the week-old ceasefire brokered by Russia and Turkey.

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