Paris (CNN) Two people have been arrested over the murder of an 85-year-old Holocaust survivor in Paris that is being investigated as a suspected anti-Semitic attack, a French judicial source told CNN on Tuesday.

Mireille Knoll was stabbed 11 times in her apartment in the 11th arrondissement of Paris before her home was set on fire, according to government spokesman Benjamin Griveaux, who recounted the attack on Twitter. Her body was discovered in her apartment on Friday.

Two men are suspected of carrying out the attack, one of them being Knoll's 27-year-old neighbor, who was previously jailed for sexually assaulting the daughter of Knoll's domestic helper, the judicial source told CNN.

The other is a 21-year-old homeless man, who was known to police for acts of violence. The source did not name the men.

The two men have been indicted for "voluntary homicide because of the true or supposed religion of the victim, theft aggravated by three circumstances and degradation of the property of others by a dangerous means," the same source said earlier.

The apartment block in the 11th arrondisement of Paris where Mireille Knoll lived.

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