Since February 5, President Bashar al-Assad's regime has intensified its bombardment of the besieged region outside Damascus, killing more than 245 civilians including dozens of children.

On Saturday, the Damascus government eased up its strikes on Eastern Ghouta as it faced Israeli air raids on what Israel said were regime and Iranian targets inside the country.

But the regime raids picked up again on Saturday night, killing six civilians and wounding more than 50 others, the Britain-based Syrian Observatory for Human Rights monitor said.

Five of those, including two children, were killed in the region's main town of Douma, Observatory head Rami Abdel Rahman said.

Western powers have expressed alarm over the government's campaign against Eastern Ghouta, where 400,000 people have been besieged since 2013, facing severe food and medicine shortages.

The UN Security Council is considering a draft resolution demanding a 30-day ceasefire in Syria to allow for urgent deliveries of humanitarian aid, according to the text seen by AFP on Friday.

Sweden and Kuwait presented the measure that would also demand an immediate end to sieges, including in Eastern Ghouta.

Negotiations on the proposed measure are to begin on Monday, and diplomats said it could quickly come to a vote at the council.

Syria's war has killed more than 340,000 people and displaced millions since it erupted in 2011 with the brutal repression of anti-government protests.