A Dutch-Turkish journalist has been detained in Turkey after posting tweets critical of Turkish President Recep Tayyip Erdogan, her newspaper said. Ebru Umar wrote a column for the Dutch Metro newspaper criticising President Erdogan's clampdown on dissent. Since 2014, prosecutors have launched cases against more than 1,800 journalists for insulting Mr Erdogan. Last week, Germany allowed the prosecution of a prominent TV satirist for insulting Mr Erdogan to proceed. Jan Boehmermann had read a crude poem on TV, aimed at testing German law. Germany and the Netherlands have old lese-majeste laws against insulting the head of a friendly state. Both...