As each new detail emerged about the ISIS terrorists who killed more than 160 people in Paris and Brussels last fall a French family was forced to revisit their loss.
Catherine Vannier lost her daughter Cécile Vannier, 17, in Februaty 2009 when an al Qaeda terror cell set off a bomb in Cairo. Two of the suspects were soon the targets of a joint French and Belgian investigation. One of them, investigators determined, had threatened to attack the same Bataclan concert hall where 89 people were killed last November during a performance by an American band.
A French parliamentary report examining intelligence failures, expected to be released Tuesday, will explore some of the missed opportunities in the Cairo case, among a litany of other shortcomings, French government sources tell NBC News.
French prosecutors declined NBC News requests for an interview.