(Latin Patriarch of Jerusalem Fouad Twal, the top Roman Catholic cleric in the Holy Land, pauses during a news conference in the northern city of Haifa, called due to recent attacks dubbed "price tagging", May 11, 2014. Twal said on Sunday a spate of attacks he described as acts of terror against the church were poisoning the atmosphere ahead of this month's visit by Pope Francis, and urged Israel to arrest more perpetrators. REUTERS/Ammar Awad)

(Latin Patriarch of Jerusalem Fouad Twal, the top Roman Catholic cleric in the Holy Land, pauses during a news conference in the northern city of Haifa, May 11, 2014. REUTERS/Ammar Awad)