[PJ-Comix]

Authorities know who he is, and they want him walking free for now. I can think of a couple of reasons for that, not all nefarious.

And what would be a non-nefarious reason for that? I mean the guy planted pipe bombs after all.

[CitizenUSA]

The authorities may be monitoring him to gather information on possible accomplices. For example, they may want to find out where he purchased materials or learned how to make the explosive devices.