TOPSHOTS A woman holds a sign reading "Peace block" after a peace march was banned by authorities in the Aksaray district of Istanbul on July 26, 2015. The Turkish army blamed PKK militants for a deadly car bomb attack that killed two of its soldiers in the Kurdish-dominated southeast, as a fragile truce risked collapsing after Ankara's air strikes on rebel positions in Iraq. Turkey has launched a two-pronged "anti-terror" cross-border offensive against Islamic State (IS) jihadists and Kurdistan Workers Party (PKK) militants after a wave of violence in the country, pounding their positions with air strikes and artillery. AFP PHOTO / OZAN KOSE