I would try him in federal court and seek the death penalty - this is exactly the kind of case it was made for.  As for Miranda warnings, I do believe he is entitled to constitutional protections but I think it may be a wise strategy to question him without Miranda.  There is probably more than enough evidence that they won't need to get a confession, or use any information they obtain against him.  And, it is more important to get information from him to find out if there are others who played a role in the bombing that could be planning the next attack.

I don't think there is much risk that the questioning will jeopardize a conviction.  I hope someone evaluated that risk.  Of course, if he is acquitted, someone's head will role.