Anti-government protesters in Bahrain swarmed back into a symbolic square on Saturday, putting riot police to flight in a striking victory for their cause.



Crowds had approached Pearl Square in Manama from different directions, creating a standoff with riot police who had moved in earlier to replace troops withdrawn on royal orders.



Suddenly police raced to their buses, which drove away mounting curbs in their haste to escape.



The protesters, cheering and waving national flags, ran to the center of the traffic circle, reoccupying it even before all the police had left. The crowd waved fleeing policemen through.



"We don't fear death any more, let the army come and kill us to show the world what kind of savages they are," said Umm Mohammed, a teacher wearing a black abaya cloak.



Troops in tanks and armored vehicles earlier withdrew from the square, which they had taken over on Thursday after riot police staged a night-time attack on sleeping protesters who had camped out there, killing four people and wounding 231.



The crowds in Pearl Square soon swelled into the tens of thousands, celebrating a triumph for the mostly Shi'ite protesters who took to the streets on Monday, inspired by popular revolts that toppled leaders in Egypt and Tunisia.



The authorities had been determined to prevent protesters from turning Pearl Square into a base like Cairo's Tahrir Square, the heart of a revolt that ousted Egypt's Hosni Mubarak.



Bahrain's 70 percent Shi'ite majority has long felt discriminated against in the Gulf Arab island that is ruled by a Sunni Muslim dynasty and is a close U.S. and Saudi ally.



Shi'ites feel cut out of decision-making and complain of unfair treatment in access to state jobs and housing.



Sixty to 80 people were taken to Salmaniya hospital after being affected by teargas or hit by rubber bullets, a doctor said. He said the hospital was full and did not have enough oxygen to deal with the rush of casualties.



More than 60 people were already in the hospital with wounds sustained on Friday when security forces fired on protesters as they headed to Pearl Square, then still in military hands.



Bahrain's crown prince called for a national day of mourning "for the sons we have lost", the state news agency reported.



Crown Prince Salman bin Hamad Al Khalifa, Deputy Supreme Commander of the Armed Forces, called for calm, asking citizens to unite and cooperate with all political forces in the country.



"I stress, once more, that our duty is to preserve security and stability, to ensure that there is no discord and that the situation does not worsen," he said in a statement.



He had earlier announced that troops had been ordered off the streets and that police would keep order.



But people power proved too strong in Pearl Square.



Some people kissed the ground in joy or started praying.



"We took this square in a peaceful manner. The Khalifa henchmen, they killed my friends here," said one protester.



On Friday, King Hamad bin Isa al-Khalifa offered a national dialogue with all parties to try to end the turmoil in which six people have been killed and hundreds wounded.



U.S. President Barack Obama spoke to the king on Friday, condemning the violence and urging the government to show restraint and respect the rights of its people.



The crown prince's orders to withdraw the military from the streets were issued a few hours later.



"That's a very positive step," Jasim Hussain, a member of the main Shi'ite Wefaq bloc that quit parliament on Thursday, told Reuters. "They're trying to ease the tensions. I don't know whether it will be sufficient."



Wefaq had earlier rejected the king's dialogue offer, saying troops must be withdrawn first, among other conditions.



Another Wefaq lawmaker said the troop pullout was not enough by itself. "There's no difference if people are killed by the military or by the security forces," said Ibrahim Mattar.



"We hope to hear a clear message from the government that it will stop killing people who are protesting peacefully."



Mattar said the king must accept the "concept" of constitutional monarchy, as well as withdrawing the military.



"Then we can go for a temporary government of new faces that would not include the current interior or defense ministers."



He reiterated an opposition demand for the king to fire his uncle, Sheikh Khalifa bin Salman al-Khalifa, prime minister since Bahrain gained its independence in 1971.



Bahrain, a minor oil producer, has long been a military ally of the West. A naval base near Manama that hosts the U.S. Navy's Fifth Fleet helps the United States to project power across the Middle East and Central Asia, including Iraq and Afghanistan.



A Fleet spokesman said there was no significant impact on operations and Jennifer Stride, spokeswoman for the U.S. naval base, said no evacuation of families was planned.



The United States is caught between the desire for stability in an ally seen as a bulwark against Iran and the need to uphold the people's right to express their grievances.

Open gallery view Bahraini protesters chanting anti-government slogans in Sitra village, Feb. 18, 2011. Credit: AP