Seven Indonesians arrested on suspicion of treasonous activity have been released, with police saying they believe the group was seeking to use a large-scale rally in the country's capital to "occupy parliament".
After weeks of monitoring, 11 people were arrested in early sweeps on Friday, just hours ahead of the demonstration against Jakarta's Christian governor that drew tens of thousands of people into the capital.
Police initially said 10 people were detained but on Saturday National Police Spokesman Inspector General Boy Rafli Amar said there were 11.
Eight including Rachmawati Soekarnoputri - one of the daughters of Indonesia's first president and the sister of former president Megawati Soekarnoputri - had since been released, he added.
Seven of those eight were detained for alleged treason, while musician Ahmad Dhani is accusing of disseminating hate speech against Indonesian President Joko Widodo.
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Meanwhile, three others remain in detention, two of whom were arrested for allegedly breaching information laws such as inciting people through social media.
Insp Gen Amar said the group had been meeting for at least three weeks and their detention was a "preventative" measure.
"The suspicion is (that they were going) to manipulate the masses to occupy parliament and then had planned to have an extraordinary (parliamentary) meeting demanding a change of government and so on," Insp Gen Amar told reporters at a press conference.
He alleged the group had hoped to deviate the masses when they were going home - plugging into those who were "not satisfied" with simply protesting.
"We don't want huge mass mobilisation to be manipulated by certain people."
How advanced discussions were over the alleged plot to overthrow the government, however, is unclear.
While the eight have been released, investigations into their activity will continue, police said.
The arrests come after last month's violent rally against Christian governor Basuki Tjahaja Purnama - commonly referred to as Ahok - over comments he made referring to the Koran.
The demonstration on November 4 started relatively peacefully but descended into violence as night fell, with waters cannons and tear gas used, hundreds injured and several police vehicles set ablaze.
President Widodo blamed "political actors" for taking advantage of the demonstration for their own gains.
Ahok is locked in a three-way race for the capital's top post with former education minister Anies Baswedan and Agus Yudhoyono, the son of former president Susilo Bambang Yudhoyono.
The election will be held in February.
He is set to face court before election day over allegations he committed blasphemy when referring to the Koran in a September speech.
