Palestinian Ambassador to Lebanon Ashraf Dabbour considered on Monday that a security plan set to kick off at the southern Ain el-Hilweh refugee camp aims at maintaining peace and stability in Palestinian camps and the brotherly ties with the Lebanese.

“The reorganization of the security forces in Ain el-Hilweh is directly followed by Palestinian President Mahmoud Abbas,” Dabbour said in an interview with As Safir newspaper.

The wife of Palestinian President Mahmoud Abbas has been treated in an Israeli hospital, media reported Sunday, as Israel searched for teenagers believed to be held captive in Palestinian territory.

Israeli news site Ynet said Amina Abbas was admitted to the private Assuta hospital in Tel Aviv on Thursday.

Israel holds the Palestinian Authority responsible for the safety of three teenagers who were kidnapped in the West Bank by a "terror organization", Prime Minister Benjamin Netanyahu said on Saturday.

"Our young people have been kidnapped by a terror organization... there is no doubt about that," Netanyahu told reporters in Tel Aviv as a massive manhunt for the three youngsters entered its third night.

The Israeli and Palestinian presidents will plant an olive tree as a symbol of peace after an unprecedented prayer meeting with Pope Francis in the Vatican Gardens on Sunday amid high tensions in the Middle East.

The Vatican said it hoped the initiative launched by Francis, which will include Christian, Jewish and Muslim prayers and music, would have an impact on public opinion but stressed it would be a purely spiritual event.

A long-awaited Palestinian unity government was sworn in before President Mahmoud Abbas on Monday after a landmark reconciliation deal with the Islamist Hamas that has infuriated Israel.

Following a ceremony at the Muqataa presidential compound in Ramallah, Abbas hailed "the end" of a bitter and sometimes bloody divide between his Fatah movement and the rival Hamas which rules Gaza.

Palestinian president Mahmoud Abbas said the line-up of a unity government will be announced Monday, after a delay over who will head the foreign ministry.

Islamists Hamas and the Western-backed Palestine Liberation Organisation, which is dominated by Abbas's secular Fatah party, signed a surprise reconciliation agreement in April to end years of rivalry.

Palestinian president Mahmoud Abbas chose a prime minister to head a unity government on Thursday but announcement of the lineup was held up over the foreign affairs portfolio, officials said.

Abbas sent a "letter of designation" to Rami Hamdallah, who is currently serving as premier within the West Bank-based government, an official in Ramallah said.

Maronite Patriarch Beshara al-Rahi announced Tuesday from the Palestinian town of Beit Sahour his rejection of the “spring” that comes through “weapons and destruction,” condemning the Israeli separation barrier that limits the Palestinians' freedom of movement.

“We thank the Lord because all the eyes of the world are focused on the land of Palestine and on the Holy Land and because the entire world has realized that this cause is a sacred cause,” al-Rahi said in his sermon as he presided over a mass in the Palestinian town.

Palestinian President Mahmoud Abbas on Sunday accepted Pope Francis' invitation to pray for peace with Israeli President Shimon Peres on June 6 at the Vatican, Palestinian chief negotiator Saeb Erakat told Agence France Presse.

Peres' spokesman said earlier that the Israeli president, who steps down at the end of next month, welcomed Francis' invitation but did not explicitly confirm he would attend.

Maronite Patriarch Beshara al-Rahi held talks Sunday in the West Bank city of Bethlehem with Palestinian President Mahmoud Abbas, who awarded him the Star of Jerusalem, a high-ranking Palestinian medal.

According to Lebanon's state-run National News Agency, the meeting was also attended by Palestinian Prime Minister Rami Hamdallah, top peace negotiator Saeb Erakat and former Latin patriarch of Jerusalem Michel Sabbah.