and quite deadly effective. one of the things we have been talking about in the last day and a half in this investigation is how law enfo e enforcement officials will be looking for a bomb-making signature. some sign that shows where the bomb was put together and where they received their instructions. as you re looking at these pictures, are these the types of things that give you a sense of these signatures? quite reminiscent of some major cases i worked on while with ncis. using a device like this, almost always there are components left behind. the crime scene processing and technicians making the initial assessment and even chemical tests are being matched up at the national center, tdac at quantico, virginia. it will be confirmed whether the device flagrated or detonated