"IS seized the Al-Sinaa neighbourhood of Deir Ezzor yesterday evening and fighting is continuing on the edge of the airport," the Syrian Observatory for Human Rights said.
An estimated 200,000 civilians are believed to remain in government-held districts of Deir Ezzor, where they have been living under siege by IS since March 2014.
The jihadists, who also control nearly all the surrounding province, have made repeated attacks on the government enclave and in January seized the suburb of Al-Bgheliyeh.
There has been growing concern for the besieged civilian population and, in January, Russia announced that it had equipped Syrian military transport aircraft to carry out aid drops to the city.
On April 10, the World Food Programme said it had carried out its first ever successful high-altitude airdrop, to deliver 20 tonnes of food aid to government-held neighbourhoods.
A previous attempt by the UN agency to drop aid to Deir Ezzor failed in February, when some of the pallets missed the drop zone and others were damaged due to their parachutes failing to function properly.
Elsewhere in Syria, government air raids on a rebel-held district of the battleground northern city of Aleppo killed seven people, the Observatory said.
The strikes on the eastern neighbourhood of Salaheddin were the latest salvo in a flareup of violence in and around Aleppo that has tested a Russian- and US-brokered ceasefire that went into force in late February.
Opposition delegates walked out of peace talks in Geneva yesterday in protest at what they said was an escalation of violence by the regime.
Al-Qaeda, like IS, is not party to the February ceasefire.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
