A day earlier, Turkish antiterrorism police detained 20 people in raids in the Turkish capital in connection with weeks of protests across the country.
The unrest began at the end of May when police used force against campaigners opposed to plans to redevelop a central Istanbul park.
The protest widened into broader demonstrations against Prime Minister Recep Tayyip Erdogan and his Islamic-rooted government.
Protests have lessened in recent days after a period of violent clashes.
Erdogan has responded by holding mass rallies across the country.
He has called the protests a plot against Turkey and has defended the police response.
So far, four people have been killed and 7,500 injured during the weeks of protests.