The monitoring group's head, Rami Abdel Rahman, said Turkish shelling struck areas of Aleppo, including Minnigh, recently taken by the Kurdish People's Protection Units (YPG) militia from Islamist rebels.
Ankara considers the Syrian Kurdish Democratic Union Party (PYD) and its YPG militia to be branches of the Kurdistan Workers Party (PKK) which has waged a decades-long insurgency against the Turkish state.
The shelling came shortly after Turkish Prime Minister Ahmet Davutoglu said Ankara would, if necessary, take military action against the PYD.
"We can if necessary take the same measures in Syria as we took in Iraq and Qandil," Davutoglu said in a televised speech.
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The Turkish premier was referring to the relentless bombing campaign last year against PKK targets in northern Iraq on their Qandil mountain stronghold.
Abdel Rahman said the Minnigh base lies between two key roads leading from Aleppo city to Azaz to the north, which would have given Kurdish fighters a launching pad to attack jihadists further east.