Eleven members of the same family from the French city of Nice are believed to have left for Syria, of whom some are suspected of planning to fight alongside jihadists, a judicial source said Wednesday.
The anti-terrorist section of the Paris public prosecutor`s office has opened an investigation into the disappearance of the family, acting on a "stack of evidence" pointing to their departure to Syria, the source said.
The family is believed to have left the country at the end of September.
The 11 include a man and his two sisters, their mother, and their respective spouses and children, including a baby, the source said.
Prime Minister Manuel Valls estimates that hundreds of French citizens have left to fight alongside extremist militants in Syria.