Palestinian demonstrators run to avoid tear gas fired by Israeli troops during a demonstration against Israel's construction of a separation barrier in the West Bank village of Bilin near Ramallah, on October 23, 2009. [Xinhua]

Palestinian demonstrators throw tear gas at Israeli troops during a demonstration against Israel's construction of a separation barrier in the West Bank village of Bilin near Ramallah, on October 23, 2009. [Xinhua]