The Istanbul Chief Public Prosecutor Office is looking into "suspicious people" who opened a banner at the rally organized by the outlawed Kurdistan Workers' Party (PKK) on Saturday in front of the Swiss federal parliament, Turkey's state-run Anadolu Agency said.
Turkish Foreign Minister Mevlut Cavusoglu had on Saturday informed Swiss counterpart Didier Burkhalter of his country's anger over the march.
The referendum on amendments to the constitution, which envisage the introduction of the presidential form of government, will be held in Turkey on April 16. "They would make our work easier", Erdogan told a rally in the southern city of Antalya.
It is expected that a lot of Turkish citizens from European countries will use their leave not in the summer but in April in order to vote in the referendum due to which intense traffic is expected at the borders with Bulgaria.
Johnson, in an exclusive interview with the Hürriyet Daily News on the occasion of the 6th meeting of the Turkey-U.K. "Tatlıdil" Forum, spoke about the U.K.'s relationship with Turkey as well as the latter's recent tension with key European countries and the EU.
If Turkish voters end up approving the constitutional changes, April 16 "would be a breaking point" in EU-Turkey relations, Erdogan said, adding: "Turkey is no one's whipping boy".
Turkey is set hold a referendum on the constitutional amendments, including giving executive powers to the president, now a ceremonial post, and abolishing the office of the prime minister.