Please provide a reference for that information concerning length of residence.
Dzhokhar Tsarnaev is said to have lived in Turkey before relocating in Massachusetts and commencing studies at the Cambridge Rindge & Latin School.
His name is listed among the recipients of Cambridge scholarships in 2011 .
His page on V Kontaktye page the Russian equivalent of Facebook states that he went to school in Makhachkala in Dagestan, which adjoins Chechnya.
Dzhokhar Tsarnaev speaks English and Russian, his profile states. His worldview derives from Islam, while his personal priorities are career and money. He is also said to belong to organizations supporting an independent Chechnya.
An online gallery of images assembled by photographer Johannes Hirn purports to show his older brother Tamerlan working out at Bostons Wai Kru Mixed Martial Arts center where he practised boxing.
It quotes him as saying, "I don't have a single American friend, I don't understand them."
After fleeing the former Soviet Union with his younger brother, Tamerlan studied at Bunker Hill Community College in Boston and aspired to be an engineer, the photo gallery states, but took time off from school to train for a boxing tournament, the National Golden Gloves competition in Salt Lake City, Utah.
He drove a Mercedes to the martial arts center, the photo essay states, and usually didnt take his shirt off out of modesty, because "I'm very religious."
Tamerlan Dzhokar was also said to have given up alcohol and tobacco because he was a devout Muslim and "God said no alcohol."
The brothers uncle, Ruslan Tsarni, told CBS that his nephews arrived in the U.S. around 2001.
They do not deserve to exist on this earth, he said.
I just wished they never existed. I am wordless.
Their parents live in Russia, the uncle said.
Dzokhar was a quiet boy, Ruslan Tsarni said. He called Tamerlan a loser and said of his death he deserved it.
But the younger brother, who in the spring of 2011 received a $2,500 scholarship from the city of Cambridge, has been a nice, quiet boy," the uncle said.
Tamerlan Tsarnaev also left behind a YouTube file of his favorite clips, which included Russian rap videos and testimonial from a young ethnic Russian man titled How I accepted Islam and became a Shiite, the New York Times reported.
An AP file from the city of Makhachkala in Russia quoted the brothers father as saying his younger son, the fugitive Dzhokar, is a smart and accomplished young medical student.
"My son is a true angel," the father told AP.
"Dzhokhar is a second-year medical student in the U.S. He is such an intelligent boy. We expected him to come on holidays here."
Alvi Karimov, spokesman for Chechnya leader Ramzan Kadyrov, told the Times the Tsarnaev family had not lived in Chechnya for many years.
In such a way, the figures who are being spoken about did not live in Chechnya at a mature age, and if they became bad guys, then this is a question that should be put to the people who raised them, the spokesman was quoted as saying.
According to the Associated Press, militants from Chechnya and other restive regions in Russias volatile North Caucasus have targeted Moscow and other areas with bombings and hostage-takings, but the allegations of involvement in the Boston Marathon explosions would mark the first time they had conducted a terror attack in the West.
The conflict in Chechnya began in 1994 as a separatist war, but quickly morphed into an Islamic insurgency whose adepts vow to carve out an independent Islamic state in the Caucasus.
Russian troops withdrew from Chechnya in 1996 after the first Chechen war, leaving it de-facto independent and largely lawless, but then rolled back three years later following apartment building explosions in Moscow and other cities blamed on the rebels.
Chechnya has stabilized under the steely grip of Kremlin-backed local strongman Ramzan Kadyrov, a former rebel whose forces were accused of massive rights abuses. But the Islamic insurgency has spread to neighbouring provinces, with Dagestan, sandwiched between Chechnya and the Caspian Sea, becoming the epicentre of violence with militants launching daily attacks against police and other authorities.
Militants from Chechnya and neighbouring provinces have launched a long series of terror attacks in Russia, including a 2002 hostage-taking raid in Moscows theatre, in which 129 hostages died, a 2004 hostage-taking in a school in the southern city of Beslan that killed more than 330 people, and numerous bombings in Moscow and other cities.
In recent years, however, militants in Chechnya, Dagestan and other neighbouring provinces have largely refrained from attacks outside the Caucasus.
The allegations of the Caucasus mens role in the Bostons explosions would reinforce long-held claims by Russian officials that insurgents in the Caucasus have been linked to al-Qaeda.