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Police are seen during an operation in the "Croix-Rouge" suburb of Reims, northern France early January 8, 2015 following the attack on satirical weekly Charlie Hebdo that left 12 dead in Paris. French police are hunting three men, including two brothers, suspected of carrying out the attack , a source close to the investigation told AFP.   Police are searching for two brothers in their thirties, including one who was sent to prison in 2008 for participating in jihadist networks attempting to send fighters to Iraq. The third suspect is aged 18, the source added. AFP PHOTO / FRANCOIS NASCIMBENI        (Photo credit should read FRANCOIS NASCIMBENI/AFP/Getty Images)
Police are seen during an operation in the "Croix-Rouge" suburb of Reims, northern France early January 8, 2015 following the attack on satirical weekly Charlie Hebdo that left 12 dead in Paris. French police are hunting three men, including two brothers, suspected of carrying out the attack , a source close to the investigation told AFP.   Police are searching for two brothers in their thirties, including one who was sent to prison in 2008 for participating in jihadist networks attempting to send fighters to Iraq. The third suspect is aged 18, the source added. AFP PHOTO / FRANCOIS NASCIMBENI        (Photo credit should read FRANCOIS NASCIMBENI/AFP/Getty Images)

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Charlie Hebdo attack: How it unfolded

A quiet day in Paris turns into a time of terror. CNN's Jonathan Mann shows us how the tragic day unfolded.

Charlie Hebdo attack: How it unfolded

A quiet day in Paris turns into a time of terror. CNN's Jonathan Mann shows us how the tragic day unfolded.