Obviously we didn't tighten up on those student visas enough. Nor deport enough. That's how the Boston Marathon got bombed.
(My bold)
Nah, the survivor is a naturalized US citizen. That's one reason we're not hauling him off to Guantanamo for interrogation nor detention.
The older brother was somewhere in the process of becoming a naturalized citizen, I believe. He may have hit a snag in the process, I don't remember what the details were on that. It should be easy enough to look that up.
At least one of the co-defendants came here on a student visa, never attended a single class and the visa had long ago expired.