A demonstrator wears a Guy Fawkes mask during a protest against the demolition of Taksim Gezi Park on May 31, 2013, in Taksim quarter of Istanbul. Police reportedly used tear gas on early May 31 to disperse a group, who were standing guard in Gezi Parki to prevent the Istanbul metropolitan municipality from demolishing the last remaining green public space in the center of Istanbul as a part of a major  renewal project of Taksim. AFP PHOTO/BULENT KILIC

In pictures: Turmoil in Turkey