BEIRUT // US-backed Syrian Kurdish forces captured a strategically important air base from ISIL in north Syria on Sunday in the first major victory for the group since the US airlifted the forces behind enemy lines four days ago.
The Syrian Democratic Forces – a Kurdish-Arab alliance – announced they had captured the Tabqa air base, 45 kilometres west of Raqqa, ISIL’s de facto capital in Syria.
The US, which has provided substantial air and ground support to the alliance, ferried hundreds of SDF forces, as well as US military advisers and US artillery, behind ISIL lines earlier this week.
The airlift was a major development to the SDF’s multi-front campaign to bear down on Raqqa, as US-backed Iraqi forces simultaneously press their assault to seize Mosul from the militants, in neighbouring Iraq. SDF forces are within 10km of Raqqa from the north.
Tabqa air base was captured by ISIL militants from the Syrian government in August 2014. Shortly afterward, the group announced it had killed about 200 government soldiers at the base, in a mass killing recorded and distributed on video over social media.
The Britain-based Syrian Observatory for Human Rights monitoring group also reported the SDF advance.
Meanwhile there were conflicting reports over whether civilians had begun evacuating Raqqa due to concerns over the stability of the nearby Tabqa Dam, which is under ISIL control.
The militants said US-led coalition air strikes had locked up the dam’s gates, causing the water level behind it to rise, and issued warnings through its propaganda agency Amaq that the dam “is threatened with collapse at any moment because of American strikes and a large rise in water levels”.
But a source at the dam said there had not yet been significant water level increases, though he acknowledged levels would rise if the facility remained out of service.
The activist group Raqqa is Being Slaughtered Silently reported that ISIL had ordered residents to evacuate, though without their furniture. Tabqa dam is 40km upstream of Raqqa on the Euphrates River.
US-led coalition forces said the dam was structurally sound.
US-backed Syrian Kurdish forces were in control of a spillway north of the dam “which can be used to alleviate pressure on the dam if need be”, the coalition said.
The coalition said the dam has not been structurally damaged, to its knowledge, and that it had not targeted the dam.
The Observatory said there were no evacuations happening from Raqqa, as did the activist-run Raqqa 24 media centre.
Raqqa 24 said engineers employed by the militants had restored power to the dam’s gates and the structure was functioning normally.
The reports from Raqqa came as a leading Syrian opposition group called on the US-led coalition to stop targeting residential areas in and around the city.
The Syrian National Coalition (SNC) said it was “increasingly concerned” about civilian casualties in the campaign against the extremist group. The exiled opposition coalition is taking part in UN-mediated talks in Geneva.
The SNC said it believed coalition forces were behind an air strike that killed at least 30 civilians sheltering in a school in the countryside outside Raqqa on March 21. The coalition has said it is investigating.
The Britain-based Syrian Observatory for Human Rights said coalition air strikes have killed 89 civilians in Raqqa province in the past week, including 35 in a school in the village of Mansoura.
* Associated Press and Agence France-Presse