The man, arrested late yesterday, was known to intelligence services for links to radical Islam, the sources said.
His brother is in custody over suspected links to Larossi Abballa, a jihadist who killed a police officer and his girlfriend in a Paris suburb in June, the sources said.
Three female suspects in the probe into the car found near Notre Dame cathedral in central Paris were also arrested yesterday, with Interior Minister Bernard Cazeneuve saying they were believed to be preparing attacks.
She had pledged allegiance to the Islamic State group in a letter, according to a source close to the investigation.
A police source said security services had issued a warning Thursday about a possible attack on train stations in Paris and the suburb where the women lived.
Four people - two brothers and their girlfriends - were already in custody over the car, found just a few hundred metres (yards) from the Notre Dame cathedral, an area always thronged with tourists.
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