The protesters chanted anti-Erdogan slogans and said they would continue to stay on the streets until Sunday‘s referendum is annulled.
"We have never had expectations from the judicial process.
They have always been partial.
We will continue to be in the streets.
We will be in the streets until the end," Yaser Sagturk said.
Other protesters talked of anxiety over the way Turkish politics is heading, and the increased power Erdogan would have in a presidential system.
"There is hatred and anxiety around us.
We are going in the direction opposite to one we should be going.
I am trying to make myself heard as this is the only thing I can do," ‘No’ voter, Aysu Kaya said.
Turkey‘s main opposition party filed a court appeal on Friday (April 21) against a decision by electoral authorities to accept unstamped ballot papers in the tightly contested referendum granting Erdogan wide new powers.
Preliminary referendum results gave a narrow 51.4 percent approval for the biggest overhaul of Turkey‘s political system since the modern state was established nearly a century ago, but opposition parties said the poll was deeply flawed.