ISTANBUL — Riot police fired water cannons and tear gas as they drove protesters out of Istanbul’s Taksim Square and neighboring Gezi Park on Saturday, an intervention that came shortly after the prime minister warned that security forces ‘‘know how to clear’’ the area, which had become a symbol of the biggest antigovernment protests in decades.
Within a half-hour, the sweep by white-helmeted riot police had emptied the park, leaving a series of colorful, abandoned tents behind. Bulldozers moved in afterward, scooping up debris as crews of workmen in hard hats and fluorescent yellow vests tore down the tents.
Protesters put up little physical resistance, even as plain-clothes police shoved many of them to drive them from the park.
Smoke billowed skyward as riot police marched inside the park Saturday. They tore down protesters’ banners, toppled a communal food stall, and sprayed tear gas over the tents, urging those inside to get out.
Images on Turkish TV showed activists carrying one woman on a stretcher through some riot police and to an ambulance, and a man splayed out, motionless, on the ground before a few others picked him up barehanded and hauled him away. For more than two weeks, protesters had defied Prime Minister Recep Tayyip Erdogan’s warnings to vacate the area.
Tayfun Kahraman, a member of Taksim Solidarity, an umbrella group of protest movements, said an untold number of people in the park had been injured — some from rubber bullets.
‘‘Let them keep the park, we don’t care anymore. Let it all be theirs. This crackdown has to stop. The people are in a terrible state,’’ he told the Associated Press by phone.
A brutal police intervention on May 31 against those protesting plans to redevelop the square and the park had sparked the biggest antigovernment protests in Turkey in decades and dented Erdogan’s international reputation.
The protests, which at one point spread to dozens of Turkish cities and towns, turned into a much broader expression of discontent about Erdogan’s government, and what many say is his increasingly authoritarian decision-making.
Erdogan, who was elected with 50 percent of the vote for his third term in 2011, vehemently rejects the accusations by protesters and points to his strong support base
According to NTV television, as they entered the park on Saturday police shouted to the protesters: ‘‘This is an illegal act, this is our last warning to you — Evacuate.’’
Hours before the police launched their operation, Erdogan had threatened protesters in a boisterous speech in Sincan, a suburb of the capital Ankara, that is a stronghold of his Justice and Development Party.
‘‘I say this very clearly: either Taksim Square is cleared, or if it isn’t cleared then the security forces of this country will know how to clear it,’’ Erdogan said.
A second progovernment rally is planned for Sunday in Istanbul, though Erdogan has previously said that the rallies were not designed as ‘‘an alternative’’ to the demonstrations at Gezi Park, but part of early campaigning for local elections next March.
On Saturday, Erdogan lashed out at what he called the ‘‘plot’’ behind the biggest street protests in his 10-year tenure.
‘‘Over the last 17 days, I know that in all corners of Turkey, millions and billions have prayed for us,’’ Erdogan said. ‘‘You saw the plot that was being carried out, the trap being set.’’ He said his supporters represented the ‘‘silent masses.’’
‘‘You are here, and you are spoiling the treacherous plot, the treacherous attack!’’ he said, insisting unspecified groups both inside and outside Turkey had conspired to mount the protests centered on Istanbul — and that he had the documents to prove it.
The crowd chanted in response: ‘‘Stand straight, don’t bow, the people are with you!’’
In his speech, he focused on some protesters who have clashed with police.
‘‘There is no breaking and burning here, we are people of love,’’ Erdogan said. ‘‘If people want to see the real Turkey, they should come here to Sincan.’’
Erdogan already has offered to defer to a court ruling on the legality of the government’s contested park redevelopment plan, and floated the possibility of a referendum on it. But concessions over the park seemed not to be enough.