The two men suspected of attacking a newspaper in Paris have stolen a car and reportedly have several hostages, Sky News reported.
A car chase is under way on the N2 motorway, and police sources say shots have been fired.
The car is now on the outskirts of Paris - around five miles from Charles de Gaulle airport - and several helicopters are reportedly hovering overhead.
Residents living nearby have been told to stay indoors.
The grey Peugot 206 was stolen from the town of Montagny Sainte Felicite this morning between Crepy-en-Valois and Nanteuil-le-Haudoin.
Almost 90,000 terror police across France are involved in the hunt for the men, believed to be behind Wednesday's terror attack in which 12 people died.