Calling suicide bombers "martyrs" is an affront to Christians, Pope Francis told pilgrims attending his general audience in Rome's St Peter's Square on Wednesday."The idea that suicide bombers can be called martyrs is repugnant to Christians," Francis said."They are not martyrs at all, and there is nothing in their aims that allows them to be considered close to the sons of God," Francis went on.Throughout history, true martyrs have shown astounding fortitude in facing their tormentors, the pontiff stressed.