Turkey deported three foreign terrorist fighters to Switzerland, the Turkish Interior Ministry said in a statement on Thursday.

The Swiss nationals were sent back to their country of origin as part of Turkey’s ramped-up efforts to repatriate foreign terrorist fighters, it added.

Turkey continues to deport foreign terrorist fighters, the statement added.

The issue of the handling of Daesh/ISIS members and their families detained in Syria — including foreign members of the terror group — has been controversial, with Turkey arguing foreign-born terrorists should be returned to their countries of origin.

Read more: Turkey deports 3 Swiss nationals for terror links