Clashes between riot police and protesters have lasted through the night in the Turkish city of Istanbul.
Police repeatedly fired volleys of tear gas, water cannon, and rubber bullets in a bid to drive demonstrators out of Taksim Square.
Protesters fought back by throwing rocks, Molotov cocktails, and fireworks.
Reports spoke of an unclear number of injured protesters, as clashes continued early June 12.
It is described as the worst night of violence since anti-government protests erupted 12 days ago.
Istanbul’s Governor Huseyin Avni Mutlu late June 11 declared that riot police would continue operations night and day to clear out protesters.
Earlier, Prime Minister Recep Tayyip Erdogan said he had “no more tolerance” for the mass demonstrations against his Islamist-rooted government.
Erdogan also reiterated his belief that the unrest was part of a conspiracy against his government.
Renewed protests were also reported in the capital, Ankara, where police fired water cannons and tear gas to disperse several hundred demonstrators.
Events in Istanbul escalated after hundreds of police early June 11 stormed Taksin Square, the epicenter of the nationwide protest movement.
The police operation seemed to catch protesters by surprise. But the demonstrators regrouped by the evening to again confront police lines.
The turmoil marks the most serious challenge to Erdogan’s government in his 10 years in power.
The protests began following a violent police crackdown against activists opposed to new construction in Gezi Park, located adjacent to Taksim Square.
But the protests soon expanded into a broader campaign against what opponents call Erdogan’s increasingly authoritarian style and his alleged attempts to impose Islamic conservative values in constitutionally secular Turkey.
Erdogan has rejected the charges, instead describing many of the protesters as hooligans and enemies of democracy.
At least four people have been reported killed and some 5,000 treated for injuries or the effects of tear gas over the past 12 days.
Turkey’s NATO ally the United States released a new statement on the crisis.
The White House described Turkey as a “close friend” and said the Obama administration was watching the events in Turkey “with concern.”
It called on Turkish authorities to uphold the fundamental freedoms of expression, assembly, association, and free and independent media.