Members of the Turkish association for International Peace and Friendship (Ubdder) and the ruling Justice and Development (AKP) party gather after putting a black wreath (R) at a blockade of anti-riot police vehicles by the Dutch embassy (Rear R) after the area was sealed off for "security reasons" as a crisis escalated between Turkey and The Netherlands after Turkey's Foreign minister was barred from speaking in the country to promote a referendum at home.