Syrian Kurds on Saturday repatriated 25 women and children from Iraq's Yazidi minority after freeing them during the final push against the Islamic State group, a local official said.

Syria's Kurds warned Sunday that the thousands of foreign jihadists they have detained in their fight against the Islamic State group are a time-bomb the international community urgently needs to defuse.

A top Kurdish official has called on Europe not to abandon Syrian Kurds once the battle against the Islamic State militants is over and to help set up an international force to protect them from Turkey.

President Bashar al-Assad warned Syria's Kurds Sunday that their ally the United States would not protect them against any Turkish offensive as Washington looks to withdraw it troops.

A Kurdish-led faction that has played a key role in fighting Islamic State in Syria has welcomed a call by US President Donald Trump for Europe to take in hundreds of Islamic State fighters captured in the war-torn country.

Kurdish-led fighters overran the last village held by the Islamic State group in Syria on Wednesday, confining its once vast cross-border "caliphate" to two small hamlets, a war monitor said.

Syria's Kurds on Wednesday rejected a US proposal for a "security zone" under Turkish control along the Syrian side of the two countries' border.

US National Security Adviser John Bolton said on Friday talks between the US military and its Turkish counterparts on the Kurds and Syria will continue next week, in the hopes of producing results both countries accept.

Syrian Kurdish leaders aim to secure a Russian-mediated political deal with President Bashar al-Assad's government regardless of US plans to withdraw from their region, a senior Kurdish official told Reuters.

Syrian troops deployed in support of Kurdish forces around a strategic northern city on Friday, in a shift of alliances hastened by last week's announcement of a US military withdrawal.

Residents and fighters in territory held by pro-Turkish rebels in northern Syria cautiously welcomed Washington's decision to pull out troops, viewing it as a chance to push further into Kurdish territory.

A car bomb killed at least eight people including four civilians near a pro-Turkey rebel post in the northern Syrian city of Afrin on Sunday, a British-based war monitor said.