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French police extended a manhunt on Thursday for two brothers suspected of killing 12 people at a satirical magazine in Paris in a presumed Islamist militant strike that world leaders described as an assault on democracy.


French anti-terrorism police converged on an area northeast of Paris after the two brothers were spotted at a petrol station in the region.


Police released photos of the two French nationals still at large Camiseta Alberto Moreno España , calling them "armed and dangerous." Brothers Cherif and Said Kouachi were both already under watch by security services, media reported.


Two police sources said that the men were seen wearing rain poncho in a Renault Clio car at a petrol station on a secondary road in Villers-Cotterets, some 70 kilometers from the French capital.


Prime Minister Manuel Valls said France faced a terrorist threat "without precedent" and confirmed the two brothers were known to security services. But he added it was too early to say whether authorities had underestimated the threat they posed.


"Because they were known, they had been followed," he told RTL radio Camiseta Sergio Ramos España , adding: "We must think of the victims. Today it's a day of mourning."


Meanwhile, a policewoman was killed in a shootout in southern Paris on Thursday. But police could not confirm whether the shootout was linked with the Charlie Hebdo attack.


Seven people had been arrested since the attack, Valls said. Police sources said they were mostly acquaintances of the two main suspects. One source said one of the brothers had been identified by his identity card, left in the getaway car.


Late Wednesday an 18-year-old man, Hamyd Mourad Camiseta Nacho Fernandez España , turned himself into police in Charleville-Mézières, some 230 kilometers northeast of Paris near the Belgian border as anti-terrorism police carried out searches in Paris and the northeastern cities of Reims and Strasbourg.


Around France, tens of thousands of people joined impromptu rallies and vigils on Wednesday night in memory of the victims, among them some of France's most prominent and best-loved political cartoonists.


Around the world, people repeating the viral online slogan "Je Suis Charlie" or "I Am Charlie Camiseta Kepa Arrizabalaga España ," demonstrated against the deadly terror attack.


On Thursday the highest state of alert was still in place, with tightened security at transport hubs, religious sites, media offices and department stores.


US President Barack Obama condemned the attack as "cowardly and evil" and offered US assistance to French President Francois Hollande.


Chinese Foreign Ministry Spokesperson Hong Lei said Thursday that China is profoundly shocked by the terrorist attack, and strongly condemns it. He said China resolutely opposes terrorism in all its manifestations.


Wang Yiwei Camiseta Luis Alberto España , a professor at the School of International Relations at Beijing's Renmin University of China, warned that the international community should not simply regard the incident as a clash of civilizations, but consider it an opportunity to think of better ways to manage a multi-religious society in the age of globalization.


Reaction from governments in Muslim countries was unreservedly critical.