The Islamic State group has claimed responsibility for an attack on a Roman Catholic church in Istanbul during a Sunday Mass that killed one person. The extremist group said in a statement late Sunday on Aamaq, the media arm of the militant group, that it “attacked a gathering of Christian unbelievers during their polytheistic ceremony” inside the Santa Maria Church in the Buyukdere neighborhood in Istanbul. Interior Minister Ali Yerlikaya said shortly before midnight two men, he described as me