Police in Norway are questioning a suspect in the worst violence in that nation since World War II.
At least 91 people died in dual attacks Friday - a bomb blast in the capital, Oslo, killed at least seven, and a shooting spree in a youth camp on a nearby island left at least 84 dead.
Norwegian media identify the man arrested after the shootings as 32-year-old Anders Behring Breivik, a blonde, blue-eyed Norwegian.
Norway's national news agency, NTB, says authorities are probing whether a second person was involved in the rampage in the camp.
CBS News National Security Analyst Juan Zarate told "Early Show on Saturday Morning" co-anchor Rebecca Jarvis, of the suspect in custody, "Police aren't saying much, but what they are indicating is that this is a right-wing extremist, somebody who has had Internet postings as well as activity online that suggest political views that are right-of-center and certainly, potentially, tied to a militant extremist groups.
"I think we'll learn more in the coming days, as authorities learn more about not only his Internet postings, but his associations. So I think it's just too early to tell exactly what his motivations were."
Zarate says the sites chosen for the attacks "have political significance. You have sites that are associated with the government of Norway, and also the future of the Labour Party, which was the youth camp.
"So, if this was a politically-motivated attack, which it appears to (have been), then those are significant sites, and he's trying to make some sort of political statement that attacks the status quo and the party that is in power.
"But I think this is in some ways, for Americans, reminiscent of both Oklahoma City and Virginia Tech (historic acts of terrorism carried out by homegrown attackers), and I think in a country like Norway, quite a shocking and horrific set of attacks."
Norway, Jarvis noted, is known for the Nobel Peace Prize.