Police have issued a photograph of a French national wanted in connection with Friday's deadly attacks in Paris that left 129 people dead.
The man, named as Salah Abdeslam, 26, is described as dangerous.
Reports say he had already been identified as the renter of a car used in the attack when he and two others were stopped by police near the Belgian border.
The officers apparently let him go after checking his ID.
Yesterday, French aircraft struck Raqqa in Syria - the stronghold of Islamic State, the militant group that has claimed it was behind the Paris attacks.
The attack was carried out in co-ordination with US forces.