"The SDF attacked positions in the direction of the Tishrin Dam," the source was quoted as saying by the broadcaster.
The Syrian army regained control of two strongholds held previously by the Kurds. The reason for the armed escalation was not immediately known.
"After fierce fighting, large columns of army reinforcements were sent to the site," the source said.
On March 10, the SDF leadership signed an agreement with the new Syrian government on the integration of all civilian and armed structures of the self-proclaimed Kurdish autonomy in northeastern Syria into state institutions, including border crossings, airports, oil and gas fields. The agreement also provided for a ceasefire throughout Syrian territory.
Syria's armed opposition captured Damascus on December 8, 2024. Bashar Assad stepped down as Syrian president and left the country. In January, Ahmed Sharaa, the leader of the new Syrian administration, was declared transitional president.