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A regime soldier and Syrian Democratic Forces (SDF) fighters were killed in separate incidents in Syria's north on Sunday.

Two members of the Kurdish-led SDF were killed by unknown gunmen near a bridge south of Raqqa city, activist Abu Omar al-Bukamali told °®Âþµº's Arabic-language sister service Al-Araby Al-Jadeed.

In northeastern Syria, the SDF launched a campaign of raids on homes in several villages in Hasakah province, al-Bukamali said.

They arrested five people accused of links to the Islamic State (IS) group during a raid in Al-Husseiniyah village in the province's east, he added.

The SDF announced Sunday the launch of Operation Al-Jazeera Thunderbolt in cooperation with the US-led international coalition against IS cells in Hasakah province.

The Kurdish-led force said 32 people were arrested on charges of belonging to the extremist group.

Also on Sunday, Syrian regime soldiers were injured after Turkish forces targeted their post in a village in the north of Aleppo province.

The UK-based Syrian Observatory for Human Rights said Turkish forces bombed several villages in the countryside in the north of the province.

The monitor added that heavy clashes broke out on Sunday, pitting Syrian regime forces and the SDF against fighters from the Turkey-backed Syrian National Army rebel group.

The monitor added that a regime soldier was killed in the clashes, which took place in the countryside near Al-Bab.

The Russian Reconciliation Center for Syria, part of Russia's armed forces, said on Saturday that two regime soldiers were injured by a drone bombing in Latakia province.