More violence in the Turkish capital Istanbul Friday as demonstrators clash with police for a fourth night.<br/> <br />Intermittent and less turbulent protests have taken place since the massive riots over the summer, but have intensified this past week after a protester was killed during clashes near the border with Syria.<br/> <br />The latest unrest comes just six months before local elections.<br/> <br />The summer protests presented one of the biggest challenges to Prime Minister Tayyip Erdogan's rule since his Islamist-rooted AK Party first came to power a decade ago.
