A protester reacts as police throw tear gas among tents during an  operation to evacuate the Gezi Park of Taksim Square in Istanbul,   Saturday, June 15, 2013.  Protesters will press on with their sit-in at an Istanbul park, an activist said Saturday, defying government appeals and a warning from Prime Minister Recep Tayyip Erdogan for the two-week standoff that has fanned nationwide demonstrations to end. (AP Photo/Thanassis Stavrakis)