Turkish security forces seized six German citizens in Turkey's southeastern province of Sanliurfa, which borders Syria, as the foreigners attempted to cross the border on Friday.
The six individuals were immediately taken in for an interrogation, as they were suspected of joining ISIS, they were later reported to be deported.
Turkish officials said that the country has deported more than 1,100 Syria-bound foreigners since January while more than 100,000 people have been detained as they were illegally attempting to cross the border between Turkey and Syria.
Accordingly, 22 foreign nationals who were trying to join ISIS were detained on Monday during 5 operations carried out by Turkish policemen in Turkey's Kilis.
A following statement by the Kilis Governorate announced that the investigation on the suspects are still continuing.
Turkey's ongoing efforts against ISIS intensified after an ISIS suicide attack on July 20 killed 34 people in the southeastern town of Suruc.
US and Turkish air forces hit several ISIS targets in Syria in recent joint operations while Turkish police operate domestic raids on areas in which the militant group may have ties to.