"I do not believe that my Kurdish brothers will respond to this appeal, which looks like the appeal to terrorism. I think that the prosecutors will do their job. Nobody has the right to intrude the peace of our country," Erdogan told reporters during his visit to Nigeria.
Turkish Interior Minister Efkan Ala has called the Demirtas's appeal "an open provocation," while the administration of Diyarbakir banned this march.
The central Sur district of Diyarbakir, which houses historic monuments dating back to 400 BC, has been the site of confrontations between the Kurdish activists and Ankara forces.
The Kurds are Turkey's largest ethnic minority and comprise some 25 percent of the country's population. The PKK has been fighting for independence of Kurdish territories from Ankara since 1984. The group, which is considered by Ankara to be a terrorist organization, seeks to create a Kurdish state in parts of Turkey and Iraq.