Government lie? pshaw.
It's quite possible the the man in orange had nothing to do with the bomber, and was part of a separate investigation. But the dog nailed him with child porn/drugs/live animals at an embarrassing time in the investigation for the FBI. So since Mr orange was only one of the people involved, they didn't want to tip off the others. If you don't like that scenario, I can think of a dozen more. Sometimes they lie for a good reason.