As for those Boston Marathon bombing suspects, a lot came out Friday about their background.
Relatives said Dzhokhar and Tamerlan Tsarnaev have been in the United States for about a decade.
They added the brothers, who lived together in Cambridge, came from a Russian region near Chechnya.
The older brother, Tamerlan Tsarnaev, practiced martial arts and boxing - even aspiring to fight on the U.S. Olympic team.
Government officials say Tamerlan traveled to Russia last year and returned to the U.S. six months later.
In a story printed in a Boston University student magazine from 2010, Tamerlan identified himself as Muslim and added he hoped to become a naturalized American.
He was quoted as saying, "I don't have a single American friend. I don't understand them."
The younger brother, Dzhokhar Tsarnaev, had been on the wrestling team at a prestigious high school and won a scholarship to pursue higher education. He is a student at Dartmouth.
On a Russian social networking site, Dzhokhar described his world view as "Islam" and said his personal goal is "career and money."
The father of the accused, speaking from Russia through a translator, said his sons were set up.
"Someone framed them, I don't know who exactly did it, but someone did. And being cowards they shot the boy dead. There are cops like this," said Anzor Tsarnaev.
The suspects' uncle says their father left the U.S., and he has not talked to him since 2009 after a falling out.
He told the media his nephews have brought shame to the family and the entire Chechen ethnicity.
"Yes, we are ashamed. They are children of my brother who had little influence on them, honestly, as much as I know, who had little influence of them," said Ruslan Tsarni.
Tsarni said he last saw the brothers in 2005. He added they struggled to settle themselves in the U.S.
He said the pair had no military training to his knowledge. Reporters asked about a motive.
"Being losers, hatred to those who were able to settle themselves, these are the only reasons I can think of. Anything else, with religion, with Islam, it's a fraud it's a fake," Tsarni said.
Friends and acquaintances of Dzhokhar Tsarnaev say they are in shock. They didn't see any signs he would be capable of such a serious crime.
"We're like the type of guys who crack jokes, and he wouldn't even like crack a joke about people because it seemed like he just didn't have a malicious bone in his body," said friend Ty Barros.
"He was just regular, pretty much. Nothing, like, caught me off guard that made suspect anything, which is why I'm really surprised about what happened because I didn't expect that at all from him," said Deana Beaulieu, a former classmate.
Officials say there are no known ties, at this point, to Chechen extremist groups. An Islamic-based insurgency fights for the region's independence from Russia.
Chechen rebels have carried out deadly bombings in Russia and the region. However, its militants have never been known to attack the West.
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