ISTANBUL/ANKARA (Reuters) - Turkish demonstrators demanded the sacking of police chiefs on Wednesday over a fierce crackdown on days of unprecedented protest against what they see as Prime Minister Tayyip Erdogan's authoritarian rule.
A delegation of activists met Deputy Prime Minister Bulent Arinc at his office in Ankara and demanded the release of detained demonstrators, a halt to the police use of tear gas, and the removal of senior officers who oversaw the crackdown.
Arinc, formally in charge of government while Erdogan is on an official visit to North Africa, has apologized for "excessive violence" by police against the initial protest in Istanbul's Taksim Square but made no public comment after the meeting.
Police use of tear gas and water cannon to disperse that initial demonstration last week triggered the most violent riots in decades and drew other groups, from professionals to students, into a broadening protest against Erdogan.
Two people have been killed and more than 3,000 injured in the six days of unrest, dealing a blow to the prime minister's image at home and abroad.
Members of more than a dozen labor unions banging drums, trailing banners and chanting "Tayyip resign" marched into Taksim, where the demonstrations have been largely peaceful in recent days after riot police withdrew.
There were similar scenes in Kizilay park, the heart of Ankara's government district, where police fired pepper spray and water cannons in a bid to disperse around 2,000 protesters.
Critics accuse Erdogan of inflaming the situation over the weekend by describing protesters in blanket terms as looters, and later associating them with terrorism. Since Erdogan left on Monday, Arinc has struck a more conciliatory tone.
But Arinc refuses to talk to unnamed groups he accuses of exploiting anger over the police action against the original protest to foment violence. Youths, some affiliated to radical left wing groups, have pulled up paving stones and smashed windows in successive nights.
The softening in tone from the AK Party (AKP) government appeared too little and too late to halt the protests.
"We will show that we will not surrender to AKP fascism with our peaceful democratic reaction in city squares," said a joint statement from two union confederations. "The AKP is trying to cow a significant portion of society to realize its own dreams of power, restricting rights and freedoms."
Erdogan, who has a huge parliamentary majority, did not comment on domestic matters at a news conference in Algiers on Tuesday. A man who rarely bows to any opposition, he clearly has no intention of stepping down and no obvious rivals inside or outside his AK party.
U.S. Vice President Joe Biden, reflecting concern about stability in a NATO ally in the Middle East, urged the Turkish government to respect the rights of political opponents.
"Today's Turkey has a chance to demonstrate that there's no need to choose between economic advancement and democracy, the system that empowers the winners of elections and yet protects those whose who are in opposition," Biden said.
A Turkish diplomatic source said Foreign Minister Ahmet Davutoglu called U.S. Secretary of State John Kerry on Wednesday, telling him Turkey was not a second-class democracy and referring to the Occupy Wall Street protests of 2011, when New York police raided a park to flush out campaigners.
The United States has held up Erdogan's Turkey as an example of an Islamic democracy that could be imitated throughout the Middle East. But domestic opponents argue that, for all the economic advances under Erdogan and early democratic reform, events have recently taken a more authoritarian turn.
They also accuse him of pursuing an "Islamist" agenda by easing restrictions on the wearing of headscarves - a symbol of female Islamic piety - in state institutions, limiting alcohol sales and promoting broader religious projects. Erdogan denies any ambition to undermine Turkey's secular constitution.
Hackers calling themselves "Anonymous Turkey" said they had attacked government systems and obtained confidential details of staff in Erdogan's office. A source in the prime ministry confirmed staff email accounts had come under a "phishing" attack to obtain confidential details but said those affected had been cut off from the network.
On Taksim, thousands remained at a makeshift camp that is taking on the look of a more enduring settlement. Small tents have appeared, food and face masks against tear gas are on sale and a library is in the making. On a street off the square some protesters skirmished overnight with police who used tear gas.
Erdogan's return on Thursday to Turkey, a country laden with political tensions on its borders with both Syria and Iraq, could prove pivotal to the unrest.
"The main concern for the moment is that the prime minister should hold his silence," said one diplomat close to the administration. "Whatever he says seems to stir feelings."
In the western port city of Izmir, police raided 38 addresses and detained 25 people on suspicion of stirring insurrection on social media with comments on the protest, opposition CHP party deputy Alaattin Yuksel told Reuters.
Police declined comment.
In a television interview this week, Erdogan described social media, including Twitter, as a "scourge". But social media have taken on a particular importance as newspapers and television have come increasingly under the sway of government.
Clashes spread overnight to the eastern province of Tunceli, where police fired tear gas and water cannon at hundreds of protesters who set up barricades and threw stones at them, witnesses said.
Police intervened in a similar way against demonstrators in Ankara, as well as in Hatay province on the Syrian border where a 22-year-old man died after being hit in the head at a rally late on Monday.
(Additional reporting by Can Sezer and Humeyra Pamuk; Writing by Nick Tattersall; Editing by Ralph Boulton and Peter Graff)