France's National Anti-Terrorism Prosecutor's Office took over the investigation into Saturday's attack in the center of Romans sur Isère, in the east of the country, by a man shouting "Allah is great" and who stabbed two people to death.
"The first investigations show a determined murderous act that aimed to seriously disturb public order through intimidation and terror, and in which two people died. Two other victims are hospitalized in serious condition," said the Anti-Terrorism Prosecutor in a statement.
After analyzing the first evidence, the prosecution opened a homicide investigation and attempted murder related to a terrorist group and criminal terrorist association.
According to the authorities, a search of the aggressor's home revealed handwritten documents "with religious overtones in which the author complains mainly of living in a country of infidels".
The perpetrator of the attack, a Sudanese born in 1987, stabbed seven people this morning in various shops and streets in the center of Romans-sur-Isère, a city of about 33,000 people 25 km from Valence.
He was detained 15 minutes later "on his knees on the sidewalk, where he prayed in Arabic," said the attorney general, who also reported on the arrest of another man who, according to the regional press, is a Sudanese roommate.