Turkey: Anti-government protests in Ankara
16 June 2013 Last updated at 00:19 BST
Riot police have moved to clear the protest camp in Istanbul's Gezi Park, using tear gas and water cannon.
In the capital Ankara, thousands of people came out on to the streets to chant anti-government slogans.
Earlier, in a speech in Ankara, Mr Erdogan told tens of thousands of AK party supporters: "If Taksim Square is not evacuated, this country's security forces will know how to evacuate it."
Chris Morris reports from Ankara.