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The suspects, two men aged 29 and 56 and a 53-year-old woman, were indicted on Friday evening by a Paris anti-terrorist judge on suspicion of forming a "terrorist criminal association", the source added.
Three others also arrested on Tuesday — two men and a woman — have since been released.
Belonging to a group calling itself "Honour and Nation", the suspects are believed to have planned a violent attack, although they were not on the verge of carrying it out, a source familiar with the investigation said.
They were arrested based on their communications, research into explosives and scouting of the potential target.
The probe is just the latest into France's far-right scene.
Last month anti-terror prosecutors requested a trial for nine members of a group calling itself OAS that was dismantled in 2017, suspected of targeting senior politicians or French Muslims.
Another organisation suspected of planning attacks on Muslims, AFO, was taken down in 2018, the same year as still another group believed to have been preparing an attempt on President Emmanuel Macron's life.
Further anti-terrorist probes relate to a neo-Nazi group suspected of targeting Jewish and Muslim places of worship and to a white supremacist who admired the perpetrator of the 2019 attack on mosques in New Zealand city Christchurch.
"I want the world to know who Atta Elayyan was," said 27-year-old Farah Talal, dressed in a green djellaba robe and an elegant white scarf during her visit to Islam's holiest city.
Judge Cameron Mander said the crimes committed by 29-year-old Australian Brenton Harrison Tarrant were so wicked that a lifetime in jail could not begin to atone for them.
Gunman Brenton Tarrant, a 29-year-old Australian, is scheduled to be sentenced this week after pleading guilty to 51 murders, 40 attempted murders and one charge of committing a terrorist act during the 2019 shooting rampage.
Outside the Al Noor mosque, dozens of leather-clad bikers from the Tu Tangata club performed a traditional Maori haka. They were welcomed by mosque imam Gamal Fouda, who said people of all beliefs and cultures were stopping to pay their respects, and they were all united as New Zealanders.
The collaboration agreement is for the Sharjah-Sat-2 project, which is a cubic satellite made up of 6 cubic pieces with dimensions of 10*20*30 centimeters in length, width, and height.
Their Highnesses Supreme Council Members and Rulers of the Emirates have sent congratulatory cables to the Custodian of the Two Holy Mosques, King Salman Bin Abdulaziz Al Saud of Saudi Arabia, on the occasion of the Kingdom's 93rd National Day.
The UAE is leading a global initiative to protect and enhance mangrove habitats, which stems from its commitment to addressing climate change and safeguarding vital coastal ecosystems worldwide.