They were rounded up in a police operation following technical and physical surveillance, the source said on the condition of anonymity.
In 2013, Turkey became one of the first countries to declare Daesh a terrorist group.
The country has since been attacked by the extremist organization multiple times. At least 10 suicide bombings, seven bomb attacks, and four armed attacks killed 315 people, and injured hundreds more.
In response, Turkey launched anti-terror operations at home and abroad to prevent further attacks.