Updated 11:30 p.m. ET
ISTANBUL Tens of thousands of people clashed with police in Turkey's four biggest cities as fierce anti-government protests continued into Sunday, according to reports.
Sunday's protests were not as violent as the past two days, which led to thousands of injuries, but police used tear gas to disperse hundreds of people in Ankara's main Kizilay square. Reuters reports similar protests erupted in Ismir and Adana, Turkey's third and fourth biggest cities.
Meanwhile, Turkey's prime minister on rejected claims that he is a "dictator," dismissing protesters as an extremist fringe.
Over the past three days, protesters around the country have unleashed pent-up resentment against Recep Tayyip Erdogan, who after 10 years in office many Turks see as an uncompromising figure with undue influence in every part of life.
A huge, exuberant protest in Taksim Square subsided overnight, but an estimated 10,000 people again streamed into the area on Sunday, many waving flags, chanting "victory, victory, victory" and calling on Erdogan's government to resign.
Some protesters have compared Erdogan to a sultan and denounced him as a dictator. Scrambling to show he was unbowed and appealing to a large base of conservative Turks who support him, Erdogan delivered two speeches on Sunday and appeared in a television interview.
With Turkish media otherwise giving scant reports about the protests, many turned to social media outlets for information on the unrest.
"There is now a menace which is called Twitter," Erdogan said. "The best examples of lies can be found there. To me, social media is the worst menace to society."
The White House Sunday called on all parties to "calm the situation," asking security forces in particular to "exercise restraint."
In a statement, spokeswoman Laura Lucas says the U.S. believes peaceful public demonstrations "are a part of democratic expression." And she says Turkey's long-term stability is best guaranteed by upholding "the fundamental freedoms of expression, assembly and association."
Under Erdogan's leadership, Turkey has boosted economic growth and raised its international profile. But he has been a divisive figure at home, with his government recently passing legislation curbing the sale of alcohol and taking a strong stand against the Syrian regime that some believe has put security at risk.
The demonstrations were ignited by a violent police crackdown on a peaceful sit-in to prevent the uprooting of trees at Taksim Square and have since spread around the country.
More skirmishes broke out in the capital, Ankara, on Sunday, with police unleashing tear gas at several thousand protesters who tried to march toward Erdogan's office from the city's main square.
A group of youths formed a barricade and hurled fire bombs or threw back gas canisters at police. An Associated Press reporter saw at least eight injured people being carried away, and police appeared to directly target journalists with tear gas.
In Taksim, dozens of people climbed on the roof of a cultural center that Erdogan says will be demolished and turned into an opera hall. A banner reading "Don't yield" was hung from the building.
"If they call someone who has served the people a 'dictator,' I have nothing to say," Erdogan said in an address to a group representing migrants from the Balkans. "My only concern has been to serve my country."
In another speech delivered an hour later, Erdogan said: "I am not the master of the people. Dictatorship does not run in my blood or in my character. I am the servant of the people."
Police and protesters also clashed violently on Friday and Saturday, leaving hundreds injured. Clouds of tear gas overwhelmed Istanbul's normally touristy city center.
Interior Minister Muammer Guler said some 1,750 people had been detained since May 28, but most had since been released.
Erdogan called the protests "ideological" and manipulated by an opposition "unable to beat (the government) at the ballot box."
He said 89 police vehicles, 42 private cars, four buses and 94 businesses were destroyed by the "vandalism" of the past two days.
Alluding to his party's strong base, Erdogan said he had the power to summon much larger numbers of his supporters at rallies.
"Our supporters are calling and saying `are we going to stay silent?' but I am urging calm," he said in an interview with Haberturk television.
Erdogan reiterated that his government would not back away from plans to uproot trees at Taksim as part of his urban renovation plans for the area. In a statement that could cause more controversy, he also declared that a mosque would be built at Taksim.
The mosque plans have long been contentious because it would further shrink the green spaces in Istanbul's city center. Some argue that there are already plenty of mosques around Taksim.
"I am not going to seek the permission of the (the opposition) or a handful of looters," Erdogan said.
Erdogan also defended his government's environmental record, saying it had planted two billion trees and built 160 parks since coming to office in 2002.
In Berlin meanwhile, about 500 people staged a peaceful solidarity protest outside the Turkish Embassy.
"The people are finally standing up, speaking up and fighting for their rights," said Hakan Tas, a deputy for the Left Party in Berlin's local assembly, who took part in the protest.