Unrest in Turkey for a third day.
Protestors have clashed with police in the capital Ankara and in Istanbul, causing some casualties.
The demonstrations were initially triggered by the government's plans to turn a city park into a shopping center.
Thousands of people flooded a busy shopping street in Ankara on Saturday, protesting against the government's plan to demolish a park in Istanbul.
Many waved Turkish flags, and some called for Prime Minister Recep Tayyip Erdogan to resign.
Police fired tear gas to hold back some stone-throwing youths.
The public anger has flared after police violently broke up an anti-development sit-in in a landmark Square in Istanbul on Friday.
The protest in Istanbul started six days ago, with residents fearing they might lose one of the sprawling city's few green spaces.
But the fierce police response has led to further fury in dozens of other cities.
Some demonstrators denounced what they see as Erdogan's increasingly authoritarian style, and some even called his government "fascist".
On Saturday, thousands of protesters attacked Erdogan's office in Istanbul with stones, leaving at least seven policemen injured.
Erdogan has acknowledged that police had used excessive force in cracking down recent demonstrations.
But he promised to stick to the redevelopment plans, insisting the protests are undemocratic and illegitimate.
Turkish President Abdullah Gul has called on both the government and protesters to end the tension.
He urged for calm and healthy democratic reactions from protesters and more attention from the security forces in handling the demonstrations.
Interior Minister Muammer Guler said on Saturday that over 900 people had been arrested in more than 90 separate protests around the country.
Reports said more than 1,000 people have been injured in Istanbul and several hundred more in Ankara.