Syrian regime forces have bombed several rebel-held areas in the country hours before a US-Russian ceasefire is set to take effect, a monitoring group reports.
A nationwide truce, part of an ambitious US-Russian plan, is set to start in Syria at sunset on Monday (local time).
The deal was hammered out between US Secretary of State John Kerry and Russian Foreign Minister Sergey Lavrov in Geneva last week.
The agreement also envisages unprecedented US-Russian military coordination against militant groups in Syria.
The Syrian government has endorsed the plan, while the opposition has voiced doubts on whether the new ceasefire will hold.
However ahead of the ceasefire the Syrian Observatory for Human Rights says warplanes have hit opposition areas in Aleppo, a major battleground in Syria's conflict.
Regime forces meanwhile shelled the opposition-controlled town of Endan in the northern countryside of Aleppo, the watchdog said.
Up to 10 civilians are believed to have been killed in the attacks.
Elsewhere in Syria, a woman was killed and others injured in an overnight shelling by regime forces on rebel districts in the north-western province of Idlib, the Observatory said.
A truce brokered by Washington and Russia in February did not hold for long in Syria.
More than 250,000 people have been killed in Syria's conflict since it started in March 2011, according to activists' estimates.
Yesterday more than 100 people were killed in separate attacks.
AAP / ITV News