CNN Forensic Files July 7, 2014 08:02:00
>> agents from the bureau of alcohol, tobacco, firearms and explosives were called in to investigate. >> we found metal fragmentation. we found pieces of pipe nickel. we picked up any pieces of wire. we found batteries. we did find some 9-volt batteries. we picked up everything. >> this clearly eliminated a gas line explosion. these were the ingredients of a pipe bomb, a homemade device in which gunpowder is packed into a steel pipe closed with metal end caps. in this case, fragments of red painted end caps were found in the rubble, along with 30-gauge blue, insulated, silver-coated copper wir...