Didn't they supposedly do this AFTER the bombing? IMO, that makes them knowing accessories.
It does if only they knew (or suspected) he did it.
As I said, it is POSSIBLE these were stupid college students trying to save a buddy from an illegal fireworks charge (if they didn't know the fireworks were empty) or maybe keep someone they thought was innocent from a big misunderstanding by the police.
If they were involved in tossing the computer (and the backpack), that story become implausible.
Please note, I'm not saying I think they were innocent. I'm saying, at this point and the paucity of information we have, it is not outside the realm of possibilities for them to have been stupid college students trying to help out (what they thought) was an innocent buddy.
My opinion is they were knowingly aiding and abetting him. I'm just not ready yet to say that with 100% certainty.