If

Fahrettin Altun ‏ Verified account @fahrettinaltun Following Following @fahrettinaltun More If a credible foreign gov't agency tells you that one of their citizens has links to terrorism, you don't take any chances. The Dutch authorities alone are in a position to explain why they arrived at that conclusion. We won't speculate on the credibility of their intelligence. 12:32 PM - 17 Jan 2019

...Rest assured that Ms. Boersma’s deportation was in no way related to her journalistic activities during her stay in Turkey.
.....The Turkish authorities have recently received intelligence from the Dutch police that Ms. Boersma had links to a designated terrorist organization and a request for information about her movements in and out of Turkey. 
....As you know, a number of terrorist groups, including PKK and ISIS, carried out deadly attacks against Turkish citizens in recent years, killing more than 2,000 innocent people. Due to the seriousness of the threat, we work closely with our friends and allies, including the Netherlands, and rely on their insights to identify and neutralize threats against Turkish and European security. Until now, the Turkish authorities, with help from their international partners, have blacklisted tens of thousands of individuals with links to terrorist organizations as part of an ongoing effort to combat extremism. 
Sincerely, Prof. Fahrettin Altun
Directorate of Communications


Le autorità giudiziarie olandesi avrebbero confermato l'esistenza di una indagine.
In generale comunque, la credibilità di un'agenzia d'intelligence dipende direttamente da quella del governo che la dirige e controlla.
Questo è il problema della Turchia quando reclama il principio di reciprocità.