It added that the US forces supported the SDF occupation of the Syrian government buildings that happened despite popular protests.
Also, the Kurdish forces kidnapped the head of Hasaka workers union from the town of Qamishli in Northern Hasaka, and transferred him to an unknown place.
The US-backed SDF forces have recently increased their separatist attempts by occupying more territories in Northeastern Syria.
In a relevant development on Sunday, Kurdish militias were deployed at the Turkish borders again after the recent withdrawal and the US military aid, amid Ankara ' s warning to Washington to establish a safe zone in Northeastern Syria, the Syrian Document Center said.
The Arabic-language Syrian Document Center news website quoted a field source as saying that the Kurdish militants have continued to resume their presence in bordering areas in new uniforms a few days after they declared withdrawal from the bordering areas in Hasaka and Raqqa under an agreement to establish a safe zone in Northeastern Syria.
It added that tens of Kurdish militias have returned to the towns of Tal Abyadh and Salouk in Northern Raqqa in different uniforms and as forces of the local military councils.
Meantime, the Syrian Observatory for Human rights reported that over 150 trucks carrying military and logistic aid as well as weapons and military equipment have been sent by the US to the regions occupied by the SDF via Simalka corridor.
Turkish President Recep Tayyip Erdogan had on Saturday criticized Washington for lagging in establishment of safe zone in Northern Syria, warning that Ankara will implement its own plans in the next three weeks if the Turkish forces are not allowed to control the region.