Amman, Jordan ? Furious Arabs stormed Middle Eastern streets Friday, screaming “Death to America” and demanding vengeance for the invasion of Iraq. Gunfire in Yemen killed three people outside the U.S. Embassy.

About 30,000 people assembled after prayers in the ancient Yemeni city of San’a and marched several miles to the embassy.

Riot troops in armored cars held the protesters off with water cannons, tear gas and, finally, live ammunition fired into the air.

Witnesses said a teenage boy was shot dead by a police bullet, and a security official who asked not to be named said a policeman was killed by a protester.

The security official said seven other policemen were wounded, and at least 30 demonstrators were overcome by gas.

Yemeni President Ali Abdullah Saleh expressed regret for the casualties and ordered an investigation. In a statement, he said people had the right to express their opinions, but “what happened damages and harms security and the nation.”

Saleh stressed he also opposed the war.

In Beirut, Lebanon, Grand Ayatollah Sheik Mohammed Hussein Fadlallah used his Friday sermon to denounce both the United States and Iraqi leader Saddam Hussein.

“We call on the Iraqi people to topple the tyrant who has destroyed Iraq and thrown the Arab and Islamic world into disarray,” said Fadlallah, a Shiite.

But, he added, he rejected “Iraq’s occupation by the arrogant powers, particularly America.”

In a statement faxed to The Associated Press, the Iraqi Communist Party, in exile, blamed both Saddam and Bush for what it said was carnage to come.

Demonstrators hold anti-U.S. banners and burn a U.S. flag, along with portraits of President Bush and British Prime Minister Tony Blair, during a demonstration in front of the Qatari embassy in Beirut, Lebanon. Some 150 people demonstrated, shouting anti-U.S. and British slogans. Protesters also carry portraits of the late Egyptian President Jamal Abdul-Nasser.

“There is no doubt about the dictator’s grave responsibility,” it said. “But this does not exclude the U.S. responsibility for the harm, the human and material damage that will befall our people.”

In Amman, 4,000 Palestinians jammed into a mosque courtyard to hear Hamza Mansour, a cleric leader of the Muslim Brotherhood, urge them to fight back with car bombs and martyr themselves to Allah.

Riot troops pumped tear gas into three crowds of stone-throwing youths in Amman, including one turned away from the Israeli Embassy.

“The Americans are targeting not only Iraq but also our nation, our dignity, our holy land,” Mansour told the chanting, cheering crowd.

Behind him on a stage, young men set alight American, British and Israeli flags. A large American flag was spread on the ground at the entrance gate where thousands of feet trampled it to tatters.

In a television address, King Abdullah II said, “I know the pain and anger you are feeling because of the suffering and ordeal that the Iraqi people are suffering,” but he urged his subjects to act in “a civilized manner.”

Meantime, Amman police entered a downtown mosque and took away two imams who delivered fiery sermons, worshippers said.

About 10,000 angry protesters surged through Cairo, the Egyptian capital, after Friday prayers. Police beat them back with riot sticks and water cannons, leaving several streaming with blood.

A smaller violent protest erupted in Bahrain, and a crowd of Palestinians marched from the al-Yarmouk refugee camp near Damascus, Syria, carrying portraits of Saddam Hussein and Yasser Arafat.

Even beyond the Middle East, Muslim clerics opposed the invasion.

“This attack is not on Iraq, it is an attack on Islam itself,” Syed Ahmed Bukhari told 6,000 followers at Friday prayers in India’s largest mosque, in New Delhi.

“The war between right and wrong has begun,” Bukhari said.

“This is a jihad. We have to sacrifice our lives for Islam.”