Tens of thousands of Lebanese Shi'ite protesters, chanting "Death to America, Death to Israel", massed in Beirut on Monday, calling for an end to Israeli strikes on Gaza that have killed 320 Palestinians.
In the Jordanian capital, Amman, about 20,000 people staged a demonstration organised by the mainstream Muslim Brotherhood, while in Cairo about 1,000 people rallied to show solidarity with Gaza Palestinians.
"In Gaza today we face, as a nation, a battle against the fate of Palestine and not the fate of the Hamas government," Hezbollah leader Sayyed Hassan Nasrallah declared to a throng of demonstrators in Beirut's southern suburbs.
"I join my voice to the voices of other Palestinian leaderships that have called for a third intifada (uprising) in Palestine and other intifadas in both the Arab and Islamic worlds...," he said.
"I believe that defending Gaza and the people of Gaza means that the nation should offer the blood of martyrs," Nasrallah said.
His comments echoed those of Hamas leader Khaled Meshaal on Saturday. The Israeli raids on Hamas-controlled Gaza are some of the worst in 60 years of Israeli-Palestinian conflict.
In the Amman rally, protesters urged Hamas to resume a campaign of suicide bombings and intensify rocket attacks.
"Oh Hamas we are your soldiers ... hit them with al-Qassam rockets ... bring the suicide bombers to Tel Aviv ," they chanted, waving the green flags of the Muslim Brotherhood who are ideological close of Hamas and the leftist opposition.
Many Jordanians whose families originally came from towns and cities in what is Palestinian territories which are now Israel support Hamas.
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The demonstrators lambasted Egyptian President Hosni Mubarak and urged his country, which has been cooperating with Israel for months in the blockade of Gaza, to allow freedom of movement for Palestinians.
In the Cairo protest outside the Journalists Union building, the crowd, which included Islamists, leftists and Arab nationalists, shouted slogans in support of Gaza Palestinians and condemning Arab governments, including Egypt's.
Similar protests took place in a string of Arab countries on Sunday.
They called on the Egyptian government to open the Rafah crossing and stop collaborating with Israel in the blockade of the impoverished coastal strip and 1.5 million inhabitants.
About the same number of riot police, armed with batons and shields, penned the protesters into a narrow area on the steps of the union and along the nearby pavement.