Jimmy Carter, the former US president, has defended his right to meet Hamas leaders during his trip to the Middle East.
Carter arrived in Syria on Friday and held talks with Bashar al-Assad, the Syrian president, before preparing to defy US and Israeli opposition by meeting with Khaled Meshaal, the Damascus-based Hamas leader.
Details on the meeting with Assad were not immediately available, but Carter's spokesman Rick Jafculca said that the two were to discuss the peace process.
On Thursday, Carter met a delegation of Hamas leaders from the Gaza Strip in Cairo and held talks with Husni Mubarak, the Egyptian president.
Speaking to the media, Carter defended his meetings with Hamas, calling them necessary in the Israeli-Palestinian peace process.
The former US president also described Israel's siege of the Gaza Strip as a crime and an atrocity on Thursday.
He said Palestinians in Gaza were being "starved to death", receiving fewer calories a day than people in the poorest parts of Africa.
"It's an atrocity what is being perpetrated as punishment on the people in Gaza," he said. "It's a crime... I think it is an abomination that this continues to go on."
Carter also said that US attempts to undermine Hamas have been counterproductive.
His meeting with leaders of Hamas, a group he insists must be included in peace negotiations, has angered many in Washington and Israel, who call the Palestinian group a terrorist organization.
The agenda
A senior Hamas official said that "the meeting between Carter and Meshaal will mainly focus on the Palestinian cause and means to deal with the Israeli occupation and its sanctions on the Palestinian people."
Mohammed Nasr said the two men would also discuss the fate of Gilad Shalit, an Israeli soldier captured by Palestinian groups in June 2006.
"In my opinion, the two are expected to discuss the Israeli soldier Shalit. I think it is natural to talk about this," Nasr said.
Earlier on Friday Hamas said Shalit would "not see the light" until Palestinian prisoners were released in a prisoner exchange.
"Gilad will not see the light, will not see his mother, will not see his father, God willing, as long as our heroic prisoners do not see their families, in their houses." Mushir al-Masri, a Hamas official, said in a speech.
Egyptian-led talks over a prisoner swap have been bogged down. Hamas has demanded the release of over hundreds of prisoners. Israel has agreed to release some inmates, but has balked at some of those on Hamas' list.
Borders sealed
Israel has meanwhile sealed off the West Bank and Gaza for 10 days as it prepares to celebrate the Jewish holiday of Passover.
Tanks and soldiers moved into position at the crossings following the shutdown that took effect early on Friday, barring Palestinians from the occupied territories from entering Israel.
The shutdown follows a statement by Hamas on Thursday that "all options are open" to avenge the killing of 20 Palestinians in a day of air assaults and ground battles in Gaza that also left three Israeli soldiers dead.
In a statement published on the internet, the armed wing of Hamas called on its fighters to attack Israel "in every place and with all means available".
"This enemy only understands the language of force," it said.
The sealing of the borders also comes after the Israeli military said on Thursday that it had foiled a third attempt in the past week by Palestinian fighters to infiltrate the Gaza crossing.
The army said three Palestinian fighters attacked Kerem Shalom, a crossing used to deliver humanitarian supplies to Gaza.
One attacker was killed while a second was wounded when Israeli troops opened fire. The third man escaped, the military said.
The Israeli military said troops would be on high alert during the holiday period, regarding it "as a highly sensitive time, security wise".
It said it would try its best to preserve the daily life of Palestinians, allowing humanitarian cases, doctors and lawyers to cross the border.
But Israel has already been restricting the flow of food and fuel supplies into Gaza since Hamas seized control of the area last June.
PHOTO CAPTION
Former President Jimmy Carter visits the grave of late Palestinian leader Yasser Arafat in the West Bank city of Ramallah April 15, 2008.
Al-Jazeera