The FBI is looking pretty silly now for having immediately said there was "no known link to terrorism" when the two men with an explosives-filled car were arrested in South Carolina last month.
The car was packed with bomb-making equipment and bullets, and even contained a videotape instructing how to make a remote-controlled detonator, "to save one who wants to be a martyr for another battle."
The FBI needs to stop reflexively making their "no terrorism involved" statements when arrests are made. It appears this is done to keep the public calm or perhaps to cover up an ongoing investigation, but the end result is that the public can't trust such statements.
Statements about terrorism links should be made after an investigation, not before.