Turkish security forces detained a Dutch woman on Monday in the southern province of Antalya, where she had allegedly been waiting for unidentified individuals to take her to Syria to join the ranks of the self-proclaimed Islamic State of Iraq and al-Sham (ISIS).

Officials also said she was being sought by Interpol. The woman was then turned over to the foreigners' department at Antalya provincial police headquarters.

A Turkish General Staff statement released on Sunday said 20 people had been detained on Saturday in the south-central province of Kilis for allegedly trying to cross illegally into Syria to join ISIS.

The suspects were traveling in a minibus toward Turkey's border with Syria when they were stopped.

Thousands of foreign fighters from all over the world are believed to have joined terrorist organizations, including ISIS, in Syria and Iraq.