Turkish authorities deported Ans Boersma, a 31-year-old correspondent for Dutch newspaper Het Financieele Dagblad, on Thursday, the paper and Turkish sources confirmed, DW reported.

"And all of a sudden, you are in an airplane going back to Netherlands," Boersma posted on Twitter, adding she had been declared "unwanted" in Turkey.

The Dutch national had been reporting for the financial paper from Istanbul since early 2017 and only received her 2019 accreditation last week. Turkish officials detained the reporter while she was visiting the local immigration office to extend her visa.

According to Erol Önderoglu, Turkey's local "Reporters Without Borders" (RSF) representative, officials told Boersma she was a threat to national security.

Boersma spent the night in the detention center and was not allowed to go back to her apartment for her belongings, according to her paper.

"At this time, all I can say is that her deportation wasn't related to her journalistic activities or her reporting from Turkey," said a Turkish official cited by the Reuters news agency said.

Het Financieele Dagblad also reported that the Dutch embassy had tried to intervene and prevent the expulsion, but without success. The paper also said it would contend the deportation alongside Boersma from the Netherlands.

However, RSF's Önderoglu told DW that a campaign for her safe return to Turkey was a "very sensitive subject."