Pope Francis has urged Muslim leaders around the world to condemn terrorism carried out in the name of Islam
"Pope Francis was returning to Rome after his three-day visit to Turkey when he made his latest commentsChristians have been targeted by Muslim hardliners in Iraq and Syria in recent years, with a violent campaign of persecution by Islamic State militants this summer when they captured the Iraqi city of Mosul.
In their joint declaration, the two Church leaders said: "We express our common concern for the current situation in Iraq, Syria and the whole Middle East.
"Many of our brothers and sisters are being persecuted and have been forced violently from their homes. It even seems that the value of human life has been lost, that the human person no longer matters and may be sacrificed to other interests. And, tragically, all this is met by the indifference of many."
The pontiff and the patriarch also called for peace in Ukraine.
The violent conflict in Ukraine this year has accentuated differences between its large Orthodox and Catholic communities.
The Pope and the patriarch said: "We pray for peace in Ukraine, a country of ancient Christian tradition, while we call upon all parties involved to pursue the path of dialogue and of respect for international law in order to bring an end to the conflict and allow all Ukrainians to live in harmony."
As his visit drew to a close, Pope Francis met Turkey’s chief rabbi, whose flock has diminished to just 17,000 people.
At the Blue Mosque on Saturday, one of the greatest masterpieces of Ottoman architecture, the Pope turned east towards Mecca, clasped his hands and paused for two minutes as the Grand Mufti of Istanbul, Rahmi Yaran, delivered a Muslim prayer."