ANKARA, Turkey -- As riot police used tear gas against protesters for a fourth straight day in Istanbul, Turkey's president and prime minister displayed wide differences Monday in their responses to those taking to the streets. One death was reported.
Turkey has seen violent demonstrations since Friday, when police launched a pre-dawn raid against a peaceful sit-in protesting plans to cut down trees in Istanbul's main Taksim Square. Since then, the demonstrations by mostly secular-minded Turks have spiraled into Turkey's biggest anti-government disturbances in years.
The protests are seen as a display of frustration with Prime Minister Recep Tayyip Erdogan, whom critics say has become increasingly authoritarian. Many accuse him of forcing his conservative, religious Islamic outlook on the lives of secular Turks.
Erdogan rejects the accusations, insisting he respects all sections of Turkish society and has no desire to infringe on different lifestyles. He has also rejected accusations of being authoritarian, saying: "I am not a master but a servant" of the people.
Turkey's main stock exchange dropped 10.5 percent Monday as investors worried about the destabilizing effect of the demonstrations on the economy. On the ground, a Turkish doctors' group said one protester died after a vehicle slammed into a crowd in Istanbul.
Erdogan, in power since 2003 after winning three landslide elections, has inflamed tensions by calling the protesters "a bunch of looters" and a "minority" who are trying to force demands on his majority.
In contrast, President Abdullah Gul took a more conciliatory line, celebrating peaceful protest as a democratic right.
The two men could compete against each other next year in Turkey's presidential election.
On Monday, Erdogan again dismissed the street protests as being organized by Turkey's opposition and extremist groups and angrily rejected comparisons with the Arab Spring uprisings.
"We already have a spring in Turkey," he said, alluding to the nation's free elections. "But there are those who want to turn this spring into winter.
"Be calm, these will all pass," he said.
Erdogan also played down the drop in the markets, saying: "It's the stock market, it goes down and it goes up. It can't always be stable."
Appearing defensive and angry, he lashed out at reporters who asked whether the government had understood the message by protesters.
"What is the message? I want to hear it from you," Erdogan retorted. "What can a softened tone be like? Can you tell me?"
He spoke to reporters before leaving on a four-day trip to Morocco, Algeria and Tunisia.
Gul said democracy was more than just going to the ballot box.
"When we speak of democracy, of course the will of the people is above all," Gul said. "But democracy does not mean elections alone. There can be nothing more natural for the expression of various views, various situations and objections through a variety of ways besides elections."
He added: "The views that are well-intentioned have been read, seen and noted and the messages have been received."
Some protesters clashed with police, but most demonstrated peacefully, chanting calls for Erdogan to resign. Those who did not take to the streets banged on pots and pans from windows.
There was scattered violence in areas close to Erdogan's offices in Istanbul and in Ankara. The Dogan news agency said police fired tear gas at one protest near Erdogan's Istanbul office, and protesters responded by hurling stones.
The agency said as many as 500 people in Ankara were detained overnight after police clashed with more militant protesters and then moved in to break up several thousand people who were demonstrating peacefully.
Turkey's Fox television reported 300 others were detained in a similar crackdown in Izmir, Turkey's third-largest city.
Social media was awash with reports and videos of police abuse. Turkey's Human Rights Foundation claimed more than 1,000 protesters were subjected "to ill-treatment and torture" by police.
Authorities said police excesses would be investigated, but they appeared to continue unabated.
Fox showed footage of police telling one group by the side of a building to come out, reassuring them that nothing would happen, then shooting a gas canister at them.
Turkish television stations have been criticized for providing very limited coverage of the protests, with media moguls apparently wary of upsetting the government. On Monday, dozens of people demonstrated in front of the Istanbul offices of private NTV television.
Another group of protesters took control of a large bulldozer in Istanbul and drove it toward police water cannons, Dogan news agency footage showed. Medics were seen tending to people injured in the skirmishes or affected by gas at a mosque close to the palace.
Erdogan also blamed the protest on "internal and external" groups bent on harming Turkey. He said the country's intelligence service was working on identifying them and threatened to hit back at them.
"We shall be discussing these with them and will be following up, in fact we will also settle accounts with them," he said.
In neighboring Iraq, Prime Minister Nouri al-Maliki said on his official website that his government was worried about the security implications of the situation in Turkey, saying the country was "an essential part of the stability of the region."
"We believe that resorting to violence will widen the circle (of violence) ... in the region, and we call for restraint," he said.
Iraq and Turkey share a long, mountainous border. Iraq is home to an ethnic Turkoman minority, centered around the disputed Iraqi city of Kirkuk.
The two countries' relationship has been increasingly strained over growing Turkish ties to Iraq's largely autonomous northern Kurdish region, and over Turkey's support for the Sunni rebels fighting to topple the Syrian regime.
The two-year Syrian civil war, which has already killed 70,000 people and sent hundreds of thousands fleeing the country, is exacerbating sectarian divisions within Iraq. Baghdad has warned that the fall of the Iranian-backed Syrian government could ignite a wider conflict in the region.