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Members of the GIPN and RAID, French police special forces, walk in Corcy, northern France, on January 8, 2015 carry out searches as part of an investigation into a deadly attack the day before by armed gunmen on the Paris offices of French satirical weekly Charlie Hebdo. A huge manhunt for two brothers suspected of massacring 12 people in an Islamist attack at a satirical French weekly zeroed in on a northern town on January 8 after the discovery of one of the getaway cars. As thousands of police tightened their net, the country marked a rare national day of mourning for January 7's bloodbath at Charlie Hebdo magazine in Paris, the worst terrorist attack in France for half a century. AFP PHOTO / FRANCOIS LO PRESTIFRANCOIS LO PRESTI/AFP/Getty Images
Members of the GIPN and RAID, French police special forces, walk in Corcy, northern France, on January 8, 2015 carry out searches as part of an investigation into a deadly attack the day before by armed gunmen on the Paris offices of French satirical weekly Charlie Hebdo. A huge manhunt for two brothers suspected of massacring 12 people in an Islamist attack at a satirical French weekly zeroed in on a northern town on January 8 after the discovery of one of the getaway cars. As thousands of police tightened their net, the country marked a rare national day of mourning for January 7's bloodbath at Charlie Hebdo magazine in Paris, the worst terrorist attack in France for half a century. AFP PHOTO / FRANCOIS LO PRESTIFRANCOIS LO PRESTI/AFP/Getty Images

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Expert: Suspects won't be taken alive

CNN Military Analyst Lt. General Mark Hertling explains what the French police and military may encounter when searching for the terror suspects.

Expert: Suspects won't be taken alive

CNN Military Analyst Lt. General Mark Hertling explains what the French police and military may encounter when searching for the terror suspects.