The advance comes just days after Kurdish fighters loyal to the Democratic Union Party (PYD) expelled jihadists allied to the Al-Nusra Front and the Islamic State of Iraq and the Levant (ISIS) from the strategic Kurdish town of Ras al-Ain.
"Clashes raged during the night from yesterday to today, pitting (Kurdish fighters) against Al-Nusra Front, ISIS and other (rebel) groups... Near the villages of Tal Alu, Karhuk and Ali Agha," said the Britain-based Observatory.
The Kurdish fighters then seized ammunition, light weapons, a vehicle mounting a heavy machine gun and a mortar launcher from the jihadists, the Observatory added.
PYD chief Salih Muslim has stated that Syria's Kurds are planning to create a temporary autonomous government to administer their regions in the north.
Kurdish regions have been administered by local Kurdish councils since President Bashar al-Assad's forces withdrew from the areas in mid-2012.
The redeployment was seen as a tactical move by the regime, freeing up forces to battle rebels elsewhere, and encouraging the Kurds to avoid allying with the opposition in order to maintain their new-found autonomy.
Kurds represent about 15 percent of the Syrian population.
Meanwhile in northwestern Syria, the air force kept up a fierce campaign against the town of Saraqeb and staged 10 air strikes there today, said the Observatory.
The strikes on the rebel-held town in Idlib province caused the collapse of several homes and injured an unknown number of people, the group added.
Air raids also hit areas where the rebels were reportedly advancing in Aleppo province in northern Syria, it said.
More than 100,000 people, most of them civilians, have died in Syria's 28-month war, the group says.
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