ALEXANDRIA, Egypt, (AFP) - More than 50,000 Egyptians rallied after Friday prayers to condemn Israel's assault against Hamas in the Gaza Strip, as sweeping protests rocked other parts of the Arab world. Legislators affiliated with the Opposition Muslim Brotherhood led the protest in the ancient Mediterranean port city that echoed to such slogans as "Down with Israel and with every collaborator." The anger was directed not only at the Jewish state, but at Arab regimes deemed to be complicit in the ongoing Israeli blockade of Gaza that has stopped refugees from getting out and humanitarian aid from getting in. "Gaza, excuse us - opening Rafah is not in our hands," went another slogan, referring to the Gaza-Egyptian border crossing that President Hosni Mubarak's government in Cairo is refusing to keep open permanently. A security official put the turnout at 50,000. Riot police were seen by an AFP correspondent in Alexandria trying to prevent the demonstration from taking place - only to give up because of the sheer numbers of protesters. In the Egyptian capital, riot police foiled demonstrations outside a number of mosques after the Ministry of Religious Affairs instructed Imams not to refer to Gaza in their sermons. In the West Bank city of Ramallah, fist-fights broke out between supporters of Hamas and the rival Fatah faction during a "day of wrath" protest, prompting police to intervene with teargas and baton-charges. Some 3,000 demonstrated at the behest of Hamas in Hebron, throwing stones at Israeli soldiers who responded with rubber bullets. Several thousand meanwhile shouted "Death to Israel" in Nablus, while young Palestinians clashed with police in Jerusalem. Up to 20,000 protesters, according to organisers, rallied in Doha responding to calls by influential Sunni Imam Sheikh Yusuf Qaradawi, who last week urged Muslims to allocate one day's worth of their monthly wages to help Gazans. In the United Arab Emirates' capital of Abu Dhabi around 3,000 demonstrators marched along the waterfront chanting anti-Israeli slogans. Some carried flags of Lebanon's Hezbollah group, prompting police to intervene. In Damascus, enraged Syrians held a mammoth rally and shouted slogans against Israeli. In Kuwait, around 3,000 gathered outside parliament and the seat of government, shouting "shame, shame" against Arab inaction vis-a-vis Gaza. In Jordan, police fired teargas at more than 2,000 anti-Israel protesters and stopped them from reaching the Israeli Embassy in the capital Amman. Water cannons were also used to disperse some of the protesters who had set off after Friday prayers from Kaloti mosque for the Embassy. Five people were arrested as demonstrators clashed with police and threw onions and stones at them. The protesters set up a symbolic graveyard in memory of the nearly 800 killed so far in Gaza, with the word "Gazan" scrawled on each mock grave. Protesters also carried banners that read "Gaza 2009: Your Majesties and Excellencies Arab Leaders, Happy New Massacre," and torched Israeli flags. A group of children carried a banner reading "Stop killing our little friends." In another demonstration, more than 150,000 people gathered in a square in Tabarbur in east Amman in support of Gaza, demanding Jordan expel the Israeli Ambassador. About 2,000 angry followers of Iraqi Imam Moqtada al-Sadr crowded into Baghdad's Sadr City on Friday to condemn Washington's support for Israel, torching US and Israeli flags. "We sympathise and understand the suffering on the people in Gaza, and the reason for their misery is the evil trinity of America, Israel and Britain," Imam Sheikh Jassem al-Motairi told namazis. Several thousands rallied in Algiers after Juma prayers, burning Israeli flags and denouncing Tel Aviv and its key ally Washington. "The army and the people are with you Gaza," they shouted, adding: "Take us to Gaza." Elsewhere on Friday: In Europe, more than 2,000 demonstrated in Athens and Thessaloniki at the behest of the Greek communist party, setting fire to US and EU flags outside the US embassy and the Israeli flag outside the Israeli mission. Smaller protests, varying from several dozen to several hundred people, took place in Bucharest, Vienna, Prague, and The Hague where the Dutch parliament's foreign affairs committee debated the Gaza conflict. In Italy, a small group representing merchants in Rome, Flaica-Uniti-Cub, called on its website for a boycott of Jewish businesses "as a sign of protest" - an idea swiftly denounced as incitement to racial hatred. In Belgium, the francophone FGTB labour federation threatened its Israeli counterpart Histadrut with expulsion from the International Trade Union Confederation if it fails to call for "peace without conditions." In Asia, about 200 women protested outside the Egyptian Embassy in Jakarta, brandishing posters of dead and wounded Palestinian children and urging Egypt to open its border with Gaza. In Malaysia, Islamic groups urged a boycott of US brands such as Coca-Cola - and a former prime minister told Malaysians working for Starbucks or McDonald's to quit - during a protest by around 300 people outside the National Mosque in the capital Kuala Lumpur. Addressing the crowd, former prime minister Mahathir Mohamad said Malaysians "will not die if they do not use the US goods" and exhorted local employees of McDonald's and Starbucks to resign. Protest rallies were also held in Sudan, Yemen, Iran and Lebanon.