A car bomb in the northern Syrian city of Manbij killed nine people and wounded 15 others, the Syrian Observatory for Human Rights said on Saturday.
The Britain-based war monitor said the casualties were members of the Turkish-backed Syrian National Army, adding that the blast occurred near a military site belonging to the faction on Al-Rabita Street.
The death toll could rise as some of the wounded were in critical condition, it said.
Manbij has been the scene of intense fighting between the Kurdish-led Syrian Democratic Forces (SDF) and Turkish-backed armed factions since the overthrow of President Bashar al-Assad in December.
Türkiye considers the Kurdish YPG militia, which dominates the SDF, an extension of the Kurdistan Workers’ Party (PKK), which Ankara, the US, and the EU classify as a terrorist organization.
Clashes between the Kurdish forces and Turkish-backed armed factions have killed hundreds on both sides.