CNN Forensic Files February 13, 2014 09:48:00
>> we were unable to associate that cooler with anyone that could be considered a person of interest. >> all of the other bomb components were common and could have been purchased anywhere, but investigators needed to find the bomber before he could strike again, since his devices were getting more sophisticated. >> we did feel that this was an escalation. it was a bigger device. it happened when more people were present. >> then a tipster came forward, a member of the church where this second bombing took place. >> the member of the church came up and said, i don't know if this means much, bu...