St. Peter's Square on Sunday will remain empty, and the pope will have to once again broadcast the Angelus from the Apostolic Palace library.
"These structures of sin replace faith with idolatry," he said.
"In recent months, violations of the cease-fire have multiplied," noted the Pope at the Regina Coeli prayer.
The Pope expressed his sympathy for the victims of a hospital fire in Iraq, and gave thanks for newly ordained priests.