Turkey protests: 'Festival atmosphere' in Istanbul
3 June 2013 Last updated at 23:06 BST
Protesters have been involved in confrontations with police for a fourth night.
Thousands of demonstrators gathered in Taksim Square, the focus of the recent protests.
A helicopter, its searchlight shining onto the crowd, hovered overhead and tear gas wafted into the square, reports the BBC's Paul Mason in Taksim Square.