Understanding the threat of Islamic extremism in Europe

Aired: 1/7/2015 | 0:08:54 | Clip
Charlie Hebdo, the publication whose staff was attacked by three gunmen in Paris, has been threatened and firebombed in the past over provocative commentary and cartoons on Islam. Michael Leiter, former director of the National Counterterrorism Center, and Bertrand Vannier of Radio France join Judy Woodruff to discuss the newspaper’s reputation and who might be behind the violence.