Suspects of Charlie Hebdo attack still at large despite intensive search(2)

Meanwhile, police patrols and security have been reinforced at public places including major stores, religious centers and public transportation systems.

On Thursday night, French Interior Minister Bernard Cazeneuve said during a press conference that nine people were put in custody as part of the investigation into Charlie Hebdo attack.

Meanwhile, the international community has strongly condemned the terror attack by all means, including holding demonstrations and protests.

Chinese President Xi Jinping on Thursday sent a message of condolences to his French counterpart, Francois Hollande, and strongly condemned the terror attack.

Terrorism is a common enemy of all mankind and a common threat to the entire international community, including both China and France, Xi said.

China is firmly opposed to all forms of terrorism, and stands ready to work with France and other countries to boost security and counter-terrorism cooperation so as to safeguard world peace and protect the people of all countries in the world, he added.

Canadian Prime Minister Stephen Harper said on Thursday that the "international jihadists" had declared war on countries around the world, but people would not be intimidated by "jihadist terrorists."

"We're just going to have to face that head on and deal with it. And that's what our government is committed to do," Harper said, warning that Canadians are not immune from terrorist threats.

U.S. President Barack Obama on Thursday visited the French embassy in Washington D.C. to pay personal condolences over the killing of 12 people, saying "As allies across the centuries, we stand united with our French brothers to ensure that justice is done and our way of life is defended."

Leaders of Singapore, Cambodia, Malta, Russia and many other countries as well as international and regional organizations, such as the African Union (AU) Commission, have all extended condolences to France, and voiced strongly condemnation over the killing.

Meanwhile, Britain has taken "precautionary" steps to increase security at the French-British border, and maintained its international terrorism threat level at "severe," the second highest of all five possible threat levels, meaning that a terrorist attack is "highly likely" and the public should remain vigilant.