Dozens of people have been killed and wounded in air strikes on villages and towns held by the Islamic State group in eastern Syria, opposition activists said.

The UN's human rights chief has appealed for more careful selection of military targets after a fresh wave of air strikes against Islamic State (IS) in eastern Syria reportedly killed at least 35 civilians, including women and children.

US-led coalition aircraft have hit two locations in northern Syria, killing at least 21 people, activists say.

The activist-run Raqqa is Being Slaughtered Silently said a school sheltering 50 families in Mansoura was levelled by air strikes on Tuesday morning.

Air strikes on rebel-held parts of the besieged city of Aleppo killed at least eight people on Tuesday.

Russian air strikes have killed more than 9,000 people in war-torn Syria in the past year, a Syrian opposition monitoring group which tracks the country's civil war has said.

At least 23 civilians were killed in renewed government airstrikes on the contested city of Aleppo as the United Nations Security Council convened an emergency meeting on the spiralling violence in Syria.

Syria's rebel-held Idlib province came under heavy bombardment on Sunday as rebels and pro-government forces battled for control of the nearby city of Aleppo, activists said.

Air strikes by the US-led coalition have killed 28 civilians, including seven children, in a village in northern Syria held by the Islamic State group, according to activists.

Anti-government activists say air strikes have killed at least 12 people at a market and other targets in the north-western Syrian city of Idlib.

Air strikes on rebel-held districts of Syria's contested city of Aleppo, including one that struck near a hospital, have killed 15 civilians and wounded many others, as fighting in the country's largest city intensified once again, opposition activists said.

Air strikes in rebel-held districts of the city of Aleppo have killed at least 10 people and left many others wounded, Syrian opposition activists said.

France started air strikes in Syria last year because of concerns months before the Paris attacks that the ringleader was plotting to target a concert and take hostages, a French newspaper has reported.

A ceasefire in Syria has been breached nine times over past 24 hours.

Warplanes yesterday unleashed air strikes on the suburbs of the Syrian capital Damascus and near the rebel-held city of Aleppo, hours before a ceasefire brokered by the US and Russia was due to go into effect at midnight.

Coalition air strikes have killed 10 Islamic State leaders over the past month, including several linked to the Paris attacks or other plots against the West, a US military official in Iraq said.

Air strikes on a fuel market in a village in northern Syria have killed and wounded dozens of people and destroyed several tanker trucks, according to opposition monitoring groups.

Hundreds of people have joined a rally to denounce Britain’s air strikes in Syria against Islamic State.

Britains' Labour party leader and his deputy have appealed for calm after a rift was caused by some party members siding with the government in last night's vote on air strikes in Syria.

British war planes are poised to begin a bombing campaign in Syria tomorrow after MPs overwhelmingly backed military action against Islamic State (IS).

Thousands took to the streets of London to protest against military intervention in Syria for the second time in four days.

Britain’s opposition Labour Party said its lawmakers could vote according to their consciences on air strikes against militants in Syria, a move which could hand prime minister David Cameron the parliamentary majority he needs.

British prime minister David Cameron has urged MPs to protect the British public by backing air strikes against Islamic State (IS) strongholds in Syria.

French parliamentarians have overwhelmingly voted to continue air strikes against Islamic State (IS) in Syria beyond early January.

David Cameron has promised to set out a “comprehensive” strategy for tackling Islamic State (IS) on Thursday that will include British air strikes on the terrorists’ bases in Syria.

The Saudi-led coalition’s air strikes against Yemen’s Shiite rebels and their allies have killed 29 people, including civilians, in the capital Sanaa, according to officials.

Syrian planes are pounding the 'Islamic State'-held town of Palmyra, killing at least 15 people in a series of air strikes, according to activists.

Amnesty says warplanes have left ‘bloody trail of civilian death’.

US-led airstrikes targeting the Islamic State group in Iraq and Syria likely have killed hundreds of civilians, a report by an independent monitoring group said. The coalition had no immediate comment.

Oil prices rallied for a second straight day yesterday after Saudi Arabia and its Gulf Arab allies began air strikes in Yemen, sparking fears of a bigger Middle East battle that could disrupt world crude supplies.