A massive bomb blast claimed by the Islamic State group killed at least 44 people and wounded dozens on Wednesday in the Kurdish-majority Syrian city of Qamishli.
It was the largest and deadliest attack to hit the city since the beginning of Syria's conflict in March 2011.
Syrian state media gave a toll of 44 dead and 140 injured in the bombing, which hit a western district of the city where several local Kurdish ministries are located.
The Britain-based Syrian Observatory for Human Rights monitor gave a toll of 48 dead, adding that children and women were among those killed.
Kurdish officials said the attack was carried out by a suicide bomber driving an explosives-laden truck.
The blast was initially described as a double bombing, but local officials and the Observatory said the bomb had detonated a nearby fuel container, leading to reports of a second explosion.
An AFP journalist saw devastating scenes in the bomb's aftermath, with distraught civilians, some covered in blood, staggering through rubble past twisted metal and the burned-out remains of cars.
One man running along the streets was completely covered in blood, his shirt drenched red.
He was gripping the arm of a small boy whose face was grey and red with blood and dust.
They ran past a hysterical woman who was crying and screaming, her clothes torn. A girl and boy stood next to her, apparently in shock.
Children could be heard screaming as smoke rose from small fires that continued to burn amongst the rubble.
Civilians and local security forces with guns slung across their backs worked to carry the dead and wounded from the remains of damaged and destroyed buildings.
The Islamic State group claimed the attack in a statement circulated on social media, calling it "a response to the crimes committed by the crusader coalition aircraft" in the town of Manbij, a bastion of the jihadist group in Syria's Aleppo province.
Kurdish fighters have been a key force battling the jihadists in north and northeastern Syria and are the main component in the Syrian Democratic Forces alliance currently seeking to oust IS from Manbij.
They are backed by air strikes launched by the US-led coalition fighting IS in Syria and Iraq.
Qamishli is under the shared control of the Syrian regime and Kurdish authorities, who have declared zones of "autonomous administration" across parts of north and northeast Syria.
It has regularly been targeted in bomb attacks, many of which have been claimed by IS.
But a source in the Kurdish Asayesh security forces told AFP that "this is the largest explosion the city has ever seen".
The area that was targeted houses several Kurdish administration buildings including the defence ministry and was considered a secure zone, with multiple checkpoints and security measures in place.
"This blast is the biggest in Qamishli in terms of both the toll and the damage since the beginning of the war," Observatory director Rami Abdel Rahman said.
Local officials said hospitals in the city had been swamped with casualties from the attack.
And Syrian state television carried an appeal from the governor of Hasakeh province, where Qamishli is located, urging residents to "go to public and private hospitals to donate blood for the victims of the terrorist bombings".
More than 280,000 people have been killed in Syria since the war began with anti-government protests that were met with a regime crackdown.
In Aleppo city, at least 16 people were killed in government air strikes and artillery fire Wednesday on rebel-held neighbourhoods in the east of the city, the Observatory said.
The monitor said the dead were civilians and that the toll could rise because people remained trapped under the rubble in some places.
The Syrian army, meanwhile, officially announced it had severed "all the supply routes and crossings used by terrorists to bring mercenaries, weapons and ammunition into eastern neighbourhoods of Aleppo".
The opposition-held east has been effectively under siege since July 7, when government forces advanced within firing range of the sole remaining route in.
Aleppo was once the country's economic powerhouse but it has been ravaged by war and divided roughly between government control in the west and rebel control in the east since mid-2012.
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