A woman who reportedly had explosives during a raid in Saint Denis was "vulnerable" and "fragile", a former school friend has claimed.

The friend, named only as Khemissa, said Hasna Ait Boulahcen had been a normal girl at school, getting good grades, but that she had gone through a bad patch, being moved between foster families.

Ait Boulahcen is understood to have activated a suicide vest during a police raid on a flat, following Friday's deadly attacks in Paris.