homes if they have any. all of that still being worked outcoming into play. what do you want to know that we are not getting an answer to? >> blessedly, there are no perfect crimes. criminals are like all of us. they take the path of least resistance. they do things where they're comfortable and do things generally in their back yards. the most difficult part of this will be, it's a bombing investigation. the most blast analytics. i have stood over many of crater from an ied in afghanistan and watched in austere conditions some of the bomb text to put together the pieces that you need to find out what the signature of the bombmaker was and then track that back and all the forensic evidence. we're blessed in the 21st century. latent fingerprints can be pulled from next to nothing. they have dna. they can track it off the bomb parts. and unexploded devices.