The journalist has recently written a very critical review of Erdogan's activity for the Dutch Metro daily and tweeted some of the article's excerpts.
"I am not free, we are going to the hospital," she stated later, pointing at the medical examination ahead of appearing before the prosecutors.
According to the Dutch Foreign Ministry, Umar has been released.
Earlier this week, reports emerged in the Dutch media, claiming the Turkish consulate in Rotterdam had emailed different Turkish organizations operating in the Netherlands with an appeal to report cases of Turkey's president being insulted.
The move sparked anger in the European country, with the Dutch authorities demanding an explanation. The Turkish consulate responded by saying the emails were sent by an employee who had made an "unfortunate choice of words."
Erdogan has been slammed for cracking down on his critics for a long time. Since becoming a president in August 2014, he has filed over 1,800 criminal cases against Turks for insulting him, according to the Turkish Justice Ministry.
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