Turkish-backed groups have killed nine civilians, including a female politician, in northeastern Syria, according to a human rights monitor.

Hevrin Khalaf, the Future Syria Party’s secretary-general, and her driver were ambushed and shot dead on Saturday, according to Kurdish forces.

“The nine civilians were executed at different moments south of the town of Tal Abyad,” the Syrian Observatory for Human Rights said.

In a statement, the political arm of the Kurdish-led Syrian Democratic Forces (SDF) said Khalaf was “taken out of her car during a Turkish-backed attack and executed by Turkish-backed mercenary factions”.

“This is clear evidence that the Turkish state is continuing its criminal policy towards unarmed civilians,” the SDF said.

Turkey launches offensive into Syria Show all 25 1 /25 Turkey launches offensive into Syria Turkey launches offensive into Syria Turkish soldiers with armored vehicles EPA Turkey launches offensive into Syria A woman flees with her children during Turkish bombardment on Syria's northeastern town of Ras al-Ain AFP/Getty Turkey launches offensive into Syria Smoke billows following Turkish bombardment on Syria's northeastern town of Ras al-Ain in the Hasakeh province along the Turkish border on October 9, 2019. - Turkey launched an assault on Kurdish forces in northern Syria with air strikes and explosions reported along the border. President Recep Tayyip Erdogan announced the start of the attack on Twitter, labelling it "Operation Peace Spring". (Photo by Delil SOULEIMAN / AFP) (Photo by DELIL SOULEIMAN/AFP via Getty Images) DELIL SOULEIMAN AFP/Getty Turkey launches offensive into Syria The first group of Turkish infantry prepare to enter Syria on the border Getty Turkey launches offensive into Syria Civilians flee AFP/Getty Turkey launches offensive into Syria Smoke billows from targets inside Syria AP Turkey launches offensive into Syria Turkish armoured vehicles enter Syria in Akcakale Getty Turkey launches offensive into Syria Civilians leave as smoke rises from Ras al-Ain AFP Turkey launches offensive into Syria A multi-rocket launcher fires in an unknown location Turkish Defence Ministry via Reuters Turkey launches offensive into Syria People wave as Turkish soldiers prepare to cross the border Getty Turkey launches offensive into Syria Girls stand together in Ras al Ain town Reuters Turkey launches offensive into Syria A woman walks as smoke billows following Turkish bombardment in Syria's northeastern town of Ras al-Ain AFP/Getty Turkey launches offensive into Syria A Turkish army's tank drives down from a truck towards the border with Syria AFP/Getty Turkey launches offensive into Syria Turkish jet taxis on tarmac after returning to a military base in southeast Diyarbakir Reuters Turkey launches offensive into Syria A Turkish armored vehicle drives down a road during a military operation in Kurdish areas of northern Syria EPA Turkey launches offensive into Syria People sit on belongings at a back of a truck as they flee Ras al Ain town Reuters Turkey launches offensive into Syria Turkey-backed Syrian opposition fighters enter Tel Abyad AFP/Getty Turkey launches offensive into Syria Civilians flee AFP/Getty Turkey launches offensive into Syria People flee Tal Abyad North Press Agency/Reuters TV Turkey launches offensive into Syria People wave as Turkish soldiers prepare to cross the border into Syria Getty Turkey launches offensive into Syria Civilians flee with their belongings AFP/Getty Turkey launches offensive into Syria Civilians flee during Turkish bombardment on Syria's northeastern town of Ras al-Ain in the Hasakeh province along the Turkish border on October 9, 2019. - Turkey launched a broad assault on Kurdish-controlled areas in northeastern Syria today, with intensive bombardment paving the way for an invasion made possible by the withdrawal of US troops. (Photo by Delil SOULEIMAN / AFP) (Photo by DELIL SOULEIMAN/AFP via Getty Images) DELIL SOULEIMAN AFP/Getty Turkey launches offensive into Syria Turkish President Recep Tayyip Erdogan, right, speaks with Defense Minister Hulusi Akar, left, as they watch the operation by Turkish forces in Kurdish areas EPA Turkey launches offensive into Syria Smoke rises from the Syrian town of Tal Abyad AFP/Getty Turkey launches offensive into Syria Turkey-backed members of Syrian National Army prepare for moving to Turkey with heavy armed vehicles EPA

Turkey and its allied fighters began an offensive on Wednesday to push back the Kurdish Peoples’ Protection Units (YPG) from its border.

The YPG is the primary component of the SDF who have been instrumental in fighting Isis in Syria.

The Turkish government has described the YPG as a “terrorist” group with links to Kurdish rebels in Turkey.

“With utmost grievance and sadness, the Syria Future Party mourns the martyrdom of engineer Havrin Khalaf, the General Secretary of Syria Future Party, while she was performing her patriotic and political duties,” the Future Party said in a statement on Khalaf’s death.

Two videos of the killings were circulated on social media by Kurdish activists.

Although the Syrian Observatory confirmed the authenticity of the videos, other news agencies, such as AFP, could not independently verify them.

A US State Department spokesperson told Reuters on Sunday that the United States had seen reports of the killings and it was looking into the incidents.

"We find these reports to be extremely troubling, reflecting the overall destabilisation of northeast Syria since the commencement of hostilities on Tuesday," the spokesperson said.

The Syrian Observatory added that the deaths brought the number of civilians killed on the Syrian side to at least 38 since the start of the offensive.

Eighty-one Kurdish fighters have also been killed in the clashes, the human rights group said.

The Turkish-backed Syrian National Army said on Saturday that it had ordered commanders to “continuously supervise combatants on the frontlines to prevent any abuse”,