The arrests were made by the local gendarmerie and members of the country's intelligence service in Mardin province.
The attacks came from two bomb-laden vehicles at a bus station in Al Bab, an area cleared by Turkey of terrorists in 2016.
Families are continuing to join an anti-PKK sit-in outside the office of HDP opposition party which has been known to have links with the terror group.
Cornered by Turkey's counterterror operations, the PKK terror group is forcefully recruiting children, but mothers are increasingly taking a stand.
The gendarmerie forces seized the cannabis and 63 kilograms of hashish in an operation targeting the PKK in Lice district of Diyarbakir.
President Recep Tayyip Erdogan recently vowed to "drain the terror swamp" in Qandil, as Turkey ramped up its assault on terror sites across its southern border.
Turkish air force launches air raid in Iraq's Kani Rash region shortly after two Turkish soldiers were killed and two others injured in an attack by the PKK.
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