They say that they have a very clear video of Suspect #2 putting down the backpack and leaving it at the location of the one of the detonations. There is also a pic of the subject making a phone call at the same time as one of the detonations. They also maintain that the unsub (unknown subject aka Suspect #2) is seen very clearly in a video reacting very uncharacteristically to a detonation and they say it is very telling as to his guilt.
Covered his ears before he blast?? Yup...that’s telling..