match through gait analysis. >> i'm coming to you today to once again ask for help with the pipe bomb investigation. we still believe there is someone out there who has information they may not have realized was significant until now. >> reporter: it's impossible to say whether the suspect even had ties to the capitol attack, or what the real goal was that day. all we know is that someone managed to plant two bombs in a city boiling with security forces and police. and all this time later, is still on the run. anderson? >> tom, thank you. perspective now from andrew mccabe. we've talked about this before. is it clear why we don't know more at this point? it's fascinating that someone can take a meandering walk in washington, d.c., at a time like