As the manhunt continues for the remaining Boston bombing suspect, 19-year-old Dzhokhar Tsarnaev, authorities must determine if the two brothers acted alone or not.
Samford University political science professor Nancy Biggio said the brothers' alienation after coming to the United States about a decade ago could have made them targets of extremist organizations.
"This is very similar to how a lot of radical terrorist are recruited from overseas. They find young men who are not comfortable. They haven't found their place in their community. This provides a community for [radical terrorists]," Biggio said.
The manhunt continues to contribute to the fear stemming back to the Monday bombing at the Boston Marathon. Biggio said like the suspects in Newtown, Conn. and the Dark Knight theater murders, the two brothers could have a problem connecting with people. Biggio said their act of terror accomplished what they wanted.
"Shows how these terrorist attacks spread the fear. This is exactly what happens. You have people across New England afraid to leave their homes and [not] carrying out their daily lives," Biggio said.
At this time it's not clear if the two brothers acted as lone wolves or worked with others. Biggio doubts the two acted in connection with another terrorist act because of the apparent lack of an exit strategy. But, Biggio said others could have been involved.
"It's purely speculation that this could have been not just two individuals but a small cell operating independently or may to prove it's self to a larger organization," Biggio said.
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