Former FBI agent, and chief of the Bin Laden unit, Kevin Foust said it was unfortunate that early media reports claiming investigators in Boston found and destroyed several unexploded devices were untrue.
Foust, now a major with the Virginia Tech Police Department, was the resident-agent-in-charge of the Roanoke office of the FBI before he retired.
He was also chief of the Bin Laden unit on September 11, 2001.
Foust said, the fact that investigators haven't linked the bombings to international terrorists yet, leaves a strong possibility it was a case of domestic terrorism.
He also said agents in the field would be looking hard at social media for videos and cell phone pictures taken at the scene.
Foust said he also went through FBI basic training with the current resident-at-in-charge of the FBI's Boston office.
Foust said, right now, he's leaning toward this being a case of domestic terrorism rather than the international sort.
"The fact that somebody was able to get into an area that I'm sure was [security] swept beforehand, deposit at least two devices, and then successfully detonate them indicates to me that it was somebody with knowledge of the area," Foust said.