Turkey's foreign ministry summoned Switzerland's deputy ambassador to Ankara on Saturday over a protest in the Swiss capital Bern against President Tayyip Erdoğan.
Some 250 people, including supporters of the outlawed Kurdistan Workers Party (PKK), staged a rally earlier on Saturday in Bern calling for a 'No' vote in an April referendum in Turkey that could give Erdoğan sweeping new powers.
The Turkish foreign ministry said it had summoned Switzerland's charge d'affairs in Ankara over the protest which it said supported terrorism and included a poster calling for the assassination of Erdoğan.
In a statement, the ministry also called on the Swiss authorities to launch a criminal investigation over the demonstration.
