Who's Behind the Designated Survivor Bombing?

Kiefer Sutherland's Tom Kirkman hasn't had much time to adjust to being president on Designated Survivor, but there's so much to be done in his first day in office.
For starters, there's figuring out who is behind the attack on the Capitol. In E! News' exclusive first look at episode two, "The First Day," you'll see new President Kirkman at work in the war room as his advisers help him figure out their first move.
Apparently residue found on the Capitol debris matches explosives used by a terrorist group, but he doesn't necessarily think that's enough evidence to tell the world who was behind the attack. And the FBI is only 75 percent sure of the culprit.
"That's as high as it gets when it comes to something like this," General Cochrane (Kevin McNally) tells Kirkman.
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