Turkey has arrested a Dutch journalist who criticised President Erdogan on Twitter, in the latest assault on free speech.

Ebru Umar, a columnist at Metro newspaper, said she was detained after calling the Turkish leader a “fraud” and referring to Turkey as “Erdoganistan”.

“Ok, police at my door for the timeline. No joke,” she wrote on Twitter, adding she was being taken to a police station in Kusadasi.

In The Hague, Foreign Ministry spokesman Herman van Gelderen confirmed that she had been detained, but had few details.