Pope Francis faces a diplomatic high-wire act on Monday as he visits sacred Muslim and Jewish sites in Jerusalem on the final day of his Middle East tour.

The pontiff is rounding off a whirlwind trip which saw him issue a unique invitation to the Israeli and Palestinian presidents to pray with him at the Vatican to end their "increasingly unacceptable" conflict, as well as snatching a personal prayer moment at Israel's controversial separation barrier.

Jordan deported two Israelis and a Briton on Sunday after a four-day detention over suspected fraud and counterfeiting currency, a security official said.

The three men, who were arrested on Wednesday, "were released and deported to their countries this morning (Sunday)," the official told Agence France Presse.

The roar of crowds welcoming Pope Francis to Jordan echoed in the dust-filled streets surrounding Amman's stadium on Saturday, where families waving Vatican flags chanted his name under the hot desert sun.

"It's a great feeling. I am so happy. We've come all the way here -- young and old, men, women and children -- to see the pope. We need his blessing," said Warda Khoury, 23, from the northeastern city of Mafraq.

Pope Francis made what he called a "heartfelt appeal" on Saturday for peace in war-torn Syria as he began a three-day pilgrimage to the Middle East.

Speaking to hundreds of Syrian refugees along the Jordan River, the pope called for an end to the civil war which has cost more than 160,000 lives, urging "all parties to abandon the attempt to resolve issues by the use of arms and return to negotiations".

From Mount Nebo, with its views of the Holy Land, to sandstone churches in dusty villages, Jordan's Christians are preparing for a papal visit they hope will boost their standing in the Middle East.

Pope Francis arrives in Amman on Saturday for the first leg of a three-day trip which will take him to the Palestinian Territories and Jerusalem with a message of inter-religious dialogue and peace for the troubled region.

Jordan has arrested two Israelis and a Briton suspected of involvement in fraud and counterfeiting currency, a security official said on Friday.

The men, arrested by security services Wednesday, are "being detained in a hotel, and not jail, for their own safety," the official said without explaining why they might be in danger.

Maronite Patriarch Beshara al-Rahi traveled Friday to the Holy Land via Amman on a religious visit that has angered Hizbullah, a sworn enemy of Israel.

The state-run National News Agency said al-Rahi was accompanied by Bishop Boulos Sayyah and Bkirki spokesman Walid Ghayyad.

Syrian rebels shelled a rally in support of President Bashar Assad's re-election, killing 21 people, after his troops cut a key rebel supply route to the main northern city of Aleppo.

Mortar fire, which hit a tent where Assad supporters had gathered in the southern city of Daraa late Thursday, also wounded at least 30, the Syrian Observatory for Human Rights said.

Jordan expressed hope Wednesday that Pope Francis' visit to the Holy Land would help the cause of regional stability as the pontiff said his trip is entirely devotional and aimed at praying for peace and improving relations with other branches of Christianity.

"It will be a purely religious trip," the Argentine pope told some 50,000 pilgrims at a general audience in St Peter's Square ahead of three-day trip to Israel, Jordan and the Palestinian Territories starting on Saturday.

Lebanon is under massive pressure as tens of thousands of refugees fleeing the war in neighboring Syria continue to stream in, likely reaching a total of 1.5 million people by the end of the year and heightening tensions in the tiny, overburdened country, U.N. officials said Monday.

The number represents one third of Lebanon's estimated population of 4.5 million, and unlike Turkey and Jordan, Lebanon has no refugee camps for Syrians, who are scattered all over in informal settlements, living with relatives or renting homes.