Demonstrators hold a placard depicting late al-Qaeda leader Osama bin Laden (L) and Kouachi brothers at the courtyard of Fatih mosque during a protest in Istanbul January 16, 2015. Turkish Islamist groups gathered at Fatih mosque to hold a special prayer for Kouachi brothers who carried out the Charlie Hebdo attack in Paris last week. The full sentence on the banner in front reads: 'If your freedom of expression has no limits, prepare yourselves for us to use our right to protest limitlessly.' The texts on banners behind read 'Three heroes who rose their voices against oppressing the Prophet. We are not silenced. We will not be silenced.' REUTERS/Murad Sezer (TURKEY - Tags: CRIME LAW POLITICS CIVIL UNREST)