Demonstrators have a sit-in protest against the goverment in the Taksim square in Istanbul on May 31. Hundreds of demonstrators gathered in Istanbul Taksim Square to have a sit-in protest, against the government's demolition to the trees in Taksim Gezi Park. Police intervened the protestors by using tear gas and pressurized water. (Xinhua/Lu Zhe)

- Police fire tear gas to disperse protester in the Taksim square in Istanbul on May 31, 2013. Hundreds of demonstrators gathered in Istanbul Taksim Square to have a sit-in protest, against the government's demolition to the trees in Taksim Gezi Park. Police intervened the protestors by using tear gas and pressurized water. (Xinhua/Lu Zhe)

- Police use the water cannon to disperse protesters in Istanbul on May 31, 2013. Hundreds of demonstrators gathered in Istanbul Taksim Square to have a sit-in protest, against the government's demolition to the trees in Taksim Gezi Park. Police intervened the protestors by using tear gas and pressurized water. (Xinhua/Lu Zhe)

A dove is flying when the heavily-armed police passed by in Istanbul on May 31, 2013. Hundreds of demonstrators gathered in Istanbul Taksim Square to have a sit-in protest, against the government's demolition to the trees in Taksim Gezi Park. Police intervened the protestors by using tear gas and pressurized water. (Xinhua/Lu Zhe)

- Police use the water cannon to disperse protesters in Istanbul on May 31, 2013. Hundreds of demonstrators gathered in Istanbul Taksim Square to have a sit-in protest, against the government's demolition to the trees in Taksim Gezi Park. Police intervened the protestors by using tear gas and pressurized water. (Xinhua/Lu Zhe)

- Police fire tear gas to disperse protester in the Taksim square in Istanbul on May 31, 2013. Hundreds of demonstrators gathered in Istanbul Taksim Square to have a sit-in protest, against the government's demolition to the trees in Taksim Gezi Park. Police intervened the protestors by using tear gas and pressurized water. (Xinhua/Lu Zhe)

- Police use the water cannon to disperse protesters in Istanbul on May 31, 2013. Hundreds of demonstrators gathered in Istanbul Taksim Square to have a sit-in protest, against the government's demolition to the trees in Taksim Gezi Park. Police intervened the protestors by using tear gas and pressurized water. (Xinhua/Lu Zhe)