The Syrian Democratic Forces are battling to oust the extremists from the northern city after breaking into its first neighbourhood last week.
After piercing into and taking the southeastern district of Al-Meshleb, the SDF fighters are now advancing towards the Old City.
In the daylight hours, at an apartment in Al-Meshleb, the Kurdish-led fighters catch some rest or sip tea after a night on the front line at the edge of the city's historic centre. "We prefer to fight in the dark as we have thermal binoculars and weapons equipped with night vision scopes," says 20-year-old Kawa, giving his nom de guerre.
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"There was fighting last night but not for long. The jihadists withdrew rapidly, faced with our attacks," says the cleanly shaven SDF fighter.
On the flat's balcony, he tries to liaise on a walkie-talkie with a fellow fighter at the front, but on the other end his colleague comes under fire. "Islamic State is attacking our positions with mortar fire. I'll get back to you when the bombardment stops," the fighter on the other end of the line says.
In Al-Meshleb, SDF fighters sometimes run into shops and houses to avoid Islamic State weaponised drones. Tolhildan Botan points to one such small unmanned aircraft at the foot of a wall in the district, which he says fellow fighters had shot down. "This is the kind of drone they use to target gatherings of fighters or military vehicles. Sometimes they even target civilians," says the SDF fighter, who did not give his age.
Baran Hassake, a fellow fighter, says battling the jihadists is easier at night. "We advance and gain ground faster and they struggle to respond to our attacks," the 18-year-old says, his head wrapped in a red scarf embroidered with green flowers. "We know now their tactics," Hassake says, boasting of knowledge acquired by the SDF, who have recaptured several former Islamic State bastions in Syria.
Empty mortar rounds litter the ground, while the corpses of jihadists at times can be seen in the rubble of destroyed buildings. The US-led coalition backing the SDF has also been intensifying its air strikes at night, SDF commanders and the Syrian Observatory for Human Rights monitor say. The United Nations on Wednesday warned of the danger for civilians of "excessive" air strikes on the city, where it says around 160,000 remain.
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The SDF has retaken three neighbourhoods since entering the city on June 6, including Al-Senaa next to the Old City on Thursday. This latest advance will allow SDF fighters to launch an assault on the Old City in Raqa's densely populated centre, which contains key Islamic State positions.
On another balcony in Al-Meshleb, Mesaab al-Hussein looks out across Al-Senaa and towards the historic city walls of ancient Raqa, which date back to the Abbasid caliphate. From 796 to 809, the powerful caliph Harun al-Rashid transferred the capital of his empire from Baghdad to Raqa, which sat at the crossroads of key trade routes.
"The SDF are nearing a part of the wall known as Baghdad gate," Hussein says. Pointing to an Islamic State flag in the distance, he adds: "We will liberate the entire city.
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