CNN CNN Newsroom With Carol Costello December 16, 2014 15:03:00
Threats against the u.s. so you can see perhaps this attack it's something of an act of desperation to show their strength striking the the weakest, softest target imaginable. these groups are heart to put down. even if they had been weakened they were not destroyed and they're able to carry out a significant attack. >> a question for you is isis in its brutal attacks inspiring other terrorist groups to act as brutally as possible? >> i think there is certainly a phenomenon where different jihadist groups are trying to outbid each other. they know that islamic state does have the media spotlig...