US-backed forces battled the Islamic State group around a key Syrian town today, after the capture of an airbase brought them closer to besieging the jihadists in their stronghold Raqa.
Backed by air power from the US-led coalition that has been bombing IS since 2014, the Syrian Democratic Forces (SDF) are laying the groundwork for an assault on the heart of the jihadists' so-called "caliphate".
Operations are currently focused on the strategically important town of Tabqa on the Euphrates River, and the adjacent dam and military airport.
Late yesterday, Arab and Kurdish fighters from the SDF seized Tabqa airbase and pressed north towards the town itself.
Rami Abdel Rahman, head of the Syrian Observatory for Human Rights monitor, said the SDF was fighting north of the airport to reinforce its positions.
"The SDF could bring supplies to the airport in the coming days and use it as a launching point for additional military operations," he added, reporting "heavy strikes" in the area.
SDF spokesman Talal Sello told AFP that the alliance would "begin rehabilitating the airport after clearing out explosive devices" left behind by IS and said the base's main landing strip was seriously damaged.
Bolstered by air strikes and military advisers from the US-led coalition, SDF units are approaching Tabqa from the south via the airport and via the north near the dam.
Today, the SDF announced it would pause fighting near the IS-held structure to allow a technical team to work on it, after it was forced out of service the previous day.
"To ensure the integrity of the Tabqa dam... We have decided to stop operations for four hours beginning at 1:00 pm (local time)... To allow a team of engineers to enter the dam and carry out their work," said SDF spokeswoman Jihan Sheikh Ahmed.
A source inside the dam told AFP the teams would carry out repairs so the dam could resume operations.
The UN has warned that damage to the dam "could lead to massive scale flooding across Raqa and as far away as Deir Ezzor" province downstream to the southeast.
IS 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".
The US-led coalition denied the dam had been "structurally damaged" and said it was "taking every precaution" to ensure its integrity.
The SDF launched its offensive for Raqa city in November, seizing around two thirds of the surrounding province, according to the Britain-based Observatory.
At their closest point, they are just eight kilometres from the city, to the northeast.
But they are mostly further away, between 18 and 29 kilometres from Raqa.
Syria's conflict began with protests against President Bashar al-Assad in 2011 but has since morphed into a brutal war pitting government forces, jihadists, rebels, and Kurds against each other.
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