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Syrian emergency response volunteers known as White Helmets carry out rescue operations at the site of air strikes in the Al Sakhour neighbourhood of the rebel-held part of eastern Aleppo on Wednesday. Image Credit: AP

Aleppo: Huge blazes erupted in Syria’s Aleppo as the city was rocked by fighting and air strikes on Thursday, ahead of last-ditch efforts by world powers to salvage a failed ceasefire.

The top diplomats from the United States and Russia were to meet with other key players in New York later on Thursday, after UN Secretary General Ban Ki-moon said Syria’s peace process was facing a “make or break moment”.

The truce deal brokered by Moscow and Washington fell apart earlier this week, ushering in a surge of fighting on all major fronts of Syria’s five-year civil war.

Heavy clashes gripped the outskirts of Aleppo on Thursday, after air strikes triggered major fires across the city’s devastated rebel-held districts.

An AFP correspondent in the eastern Bustan Al Qasr neighbourhood reported that his entire street was in flames following the predawn strikes.

Volunteer firefighters battled throughout the night to contain the blazes, which local activists at the Aleppo Media Centre said were caused by “incendiary phosphorous bombs”.

In footage posted by the group, a ball of flame shoots up over the city, lighting up the skyline and sparking fires on the horizon.

The Syrian Observatory for Human Rights said 14 strikes on the rebel-held neighbourhoods of Bustan Al Qasr and Al Kalasseh “led to massive fires” overnight.

Observatory head Rami Abdul Rahman said they were “the most intense strikes in months” on those two districts and that they had killed seven people, including three women and three children.

The Britain-based monitor also reported fierce clashes in Aleppo’s southwestern district of Ramousah, where rebel groups are fighting off a government offensive.

A United Nations aid convoy was due to deliver aid on Thursday to besieged areas near the Syrian capital after a 48-hour suspension to review security guarantees in the wake of a deadly attack on relief trucks near Aleppo, a UN spokesman said.

“We are sending today an inter-agency convoy that will cross conflict lines into a besieged area of rural Damascus,” Jens Laerke, spokesman of the UN Office for the Coordination of Humanitarian Affairs, told Reuters. “We will advise on the exact locations once the convoy has actually reached those locations.” Elizabeth Hoff, the World Health Organisation (WHO) representative in Syria, told Reuters on Wednesday that the UN health agency planned to deliver medical supplies on Thursday to the rebel-held besieged Damascus suburb of Moadamiya, subject to the normal security risk assessments.

Fighting was also reported on Thursday in the central provinces of Homs and Hama, and east of Damascus in the opposition stronghold of Eastern Ghouta.

As violence escalated on the ground, diplomatic efforts were set to continue in New York with a new meeting of the International Syria Support Group (ISSG) on Thursday.

The ISSG, chaired by Moscow and Washington, met for an hour earlier this week but made little headway in agreeing on the next steps to end the war that has killed 300,000 people.

Moscow is a key ally of President Bashar Al Assad while Washington has supported moderate rebel groups opposed to his regime.

The latest Syria truce deal was reached after marathon talks between US Secretary of State John Kerry and Russian Foreign Minister Sergei Lavrov earlier this month in Geneva.

It called for an end to fighting between regime forces and non-terrorist rebels, excluding extremists like Daesh, as well as increased aid deliveries.

The truce broke down on Monday night, when Syria’s military announced an end to a weeklong freeze on fighting.

In his address to the Security Council on Wednesday, Lavrov said there would be “no more unilateral pauses” by Syrian government forces, arguing that rebels had previously used ceasefires to regroup.

Sounding a cautious note, Kerry said late Wednesday: “It’s going to be difficult. We’ll see what people are willing to do.”

During his own impassioned address to the Security Council, Kerry demanded that Russia force its ally in Damascus to ground its air force in the wake of a deadly raid on an aid convoy in northern Syria.

Kerry said the strike — which killed about 20 civilians and destroyed 18 aid trucks — raised “profound doubt” about whether Russia and its Syrian ally were committed to upholding a ceasefire.

The strike was furiously condemned by aid organisations and the United Nations briefly halted its aid operations, before announcing it was ready to resume them on Wednesday.

Moscow denies that Russian or Syrian planes carried out the raid and instead said a coalition drone was in the area when the aid trucks were hit.

Russia’s foreign ministry said the “unsubstantiated, hasty accusations” seemed designed to “distract attention from the strange ‘error’ of coalition pilots,” referring to a US-led strike that killed dozens of Syrian soldiers at the weekend.