ISTANBUL (AP) — Turkish prosecutors detained a prominent philanthropist for alleged ties to a 2016 coup attempt Tuesday night, just hours after a court acquitted him on terrorism-related charges and ordered his release from jail after 840 days.

The Istanbul prosecutor's office said in a statement that it planned to appeal the verdict of a panel of judges finding Osman Kavala not guilty and setting him free. Prosecutors also ordered Kavala to remain jailed while he is investigated in a separate case.

Earlier Tuesday, a panel of judges acquitted Kavala and eight other activists of charges related to anti-government protests in 2013. They were accused of organizing the protests in an attempt to overthrow the Turkish government.

The prosecutor's office said it is investigating him for an attempted overthrow of the Turkish constitutional order through alleged links to the 2016 coup attempt. The Turkish government blames on U.S.-based cleric Fethullah Gulen.

More than a hundred supporters waiting to see Kavala, 65, walk free from the prison where he has spent more than two years in pretrial detention were stunned by the news. An anxious silence took over the crowd.

Similar detention orders, overturning court decisions, have taken place before in the case of jailed writers.

Kavala, 63, is a former entrepreneur who founded a nonprofit organization, Anadolu Kultur, that focuses on cultural and artistic projects promoting peace and dialogue. The 2013 protests at the center of the first case started to oppose the planned development of a small park in central Istanbul. The Gezi Park demonstrations grew into a wider protest movement across Turkey.

Kavala was arrested in November 2017, four years after the protests. The European Court of Human Rights ruled for his immediate release in December, saying Kavala's extended time in custody served “the ulterior purpose of reducing him to silence” with a “chilling effect on civil society.”

He rejected the accusation that he organized and financed the 2013 protests. He said he took part in peaceful activities to defend the environment and the park, which is near his office.

THIS IS A BREAKING NEWS UPDATE. AP’s earlier story follows below.

A court in Istanbul on Tuesday acquitted nine leading Turkish civil society activists of terrorism-related charges related to anti-government protests, including a renowned philanthropist who has been jailed for more than two years.

Critics saw the charges and resulting trial as a momentous bid by those in power to crack down on opposition voices and criminalize mass anti-government protests. A total of 16 people were accused of organizing or aiding in the 2013 protests in an attempt to violently overthrow the government.

A panel of judges ordered the release of civil society defender and ex-businessman Osman Kavala, the only acquitted defendant still in custody. The panel said seven defendants who live abroad should be brought in for questioning.

Supporters broke into applause and tears when a judge quickly read the panel's verdict for acquitting the activists instead of convicting them and imposing the lengthy sentences many had feared. The judge said Turkish authorities did not present enough “concrete and certain evidence” to convict.

“It’s a great verdict. Acquittal was the only thing that could be just. This is the verdict we should have been given two years ago," Andrew Gardner of Amnesty International told The Associated Press. "We will have to see what comes next but today is a decision to celebrate.”

The protests at the center of the case started to oppose the planned development of a small park in central Istanbul into an Ottoman-style shopping mall. The Gezi Park demonstrations grew into a wider protest movement across Turkey, challenging Turkey's prime minister at the time and now president, Recep Tayyip Erdogan.

Hours after the verdict, presidential spokesman Ibrahim Kalin said of the protests: “We should never get out of our minds that the process hurt Turkey as a whole.”

More than 300 people came to watch the trial Tuesday, joining lawmakers, foreign delegates and rights group members at a courthouse near the Silivri maximum security prison campus, on the outskirts of Istanbul. Hundreds of others waited outside.

Many observers burst into applause when Kavala entered the courtroom and after some of the testimony, prompting warnings from the court. The atmosphere was tense. The court rejected requests to hear the testimony of defense witnesses and to give the defendants more time to respond to the prosecutor’s sentencing statement.

The tension built to an uproar when security forces tried to remove a defense lawyer from the courtroom. Officers in riot gear arrived after members of the audience and lawyers loudly voiced their objections.

“Complaints of the lawyer not being heeded by the court, statements by the defendants, really seemed to fall on deaf ears in terms of the panel of judges," Gardner said, describing the trial as a roller-coaster. "And then suddenly, for the judge to announce a not-guilty verdict for all, is incredible.”

The prosecutor had sought a life sentence in solitary confinement without parole for Kavala, architect Mucella Yapici and Yigit Aksakoglu, who works on early childhood development and spent 221 days in pretrial detention. They denied trying to overthrow the government and say the protests were an exercise of democratic rights.

Kavala, 63, founded a nonprofit organization, Anadolu Kultur, that focuses on cultural and artistic projects promoting peace and dialogue. He rejected the accusation that he organized and financed the 2013 protests. He said he took part in peaceful activities to defend the environment and the park, which is near his office.

Kavala was arrested in November 2017, four years after the protests. The European Court of Human Rights ruled for his immediate release in December, saying Kavala's extended time in custody served “the ulterior purpose of reducing him to silence” with a “chilling effect on civil society.”

The Istanbul court did not heed the European court's order during two previous hearings but ruled in favor of Kavala's release. More than a hundred of his supporters waited near the prison Tuesday evening in hopes of seeing him walk free.

Prosecutors had requested prison terms of 15-20 years for the six other acquitted defendants - filmmakers, a lawyer and an urban planner - charged with aiding the attempt to overthrow the government.

The urban planner, Tayfun Kahraman, tweeted after his acquittal: “The Gezi trial finally ended with the decision that was deserved. We have always stood up straight with your support for our struggle to defend Gezi and our city.”

An estimated 3.6 million people joined the Gezi Park protests, according to government estimates, and thousands were injured. Police used tear gas and water cannons to disperse mostly peaceful protesters and were accused of using excessive force.

The Turkish Bar Association put the number of people killed during the anti-government protests at 15, including a police officer. Prosecutors said in their criminal indictment that there were five protest-related deaths.

The discrepancy stems from the bar association's inclusion of deaths from heart attacks and cerebral hemorrhages thought to be caused by pepper spray, as well as of people killed at other protests during the same period.

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Robert Badendieck in Istanbul and Suzan Fraser in Ankara, Turkey contributed to this report.