Officials say no evidence has surfaced that he met Mr. Tsarnaev in Dagestan last year.
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It was not known whether he had spent any significant amount of time in Dagestan's capital.
She is an Avar, from one of the dozens of ethnic groups in Dagestan.
Despite the violence in Dagestan, Tamerlan Tsarnaev "didn't want to leave, " his father said.
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He led a small militant group in Dagestan that had links to Imarat Kavkaz.
Ms. Tsarnaeva's family who are Avars, one of the largest ethnic groups in Dagestan come from Makhachkala.
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Mr. Magomedov, the friend from the mosque, said the bombing in Boston has puzzled people in Dagestan.
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The Tsarnaev family had lived briefly in Dagestan before moving to the United States a decade ago.
In the 1990s, separatist warlords from neighbouring Chechen openly led armed operations in Dagestan on several occasions.
His parents in Dagestan decided not to fly the remains there for burial, said family spokeswoman Heda Saratova.
In 2012, his older brother spent six months with relatives in Dagestan, which has an Islamist militant insurgency.
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Asked if it was possible Tamerlan encountered Muslim fundamentalists while in Dagestan, he said there was no way.
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Local authorities in Dagestan say Mr. Tsarnaev, perhaps knowing he would be monitored, didn't use a mobile phone there.
The brothers have roots in Dagestan and neighboring Chechnya, but had lived in the U.S. for about a decade.
In Dagestan, the current epicenter of the violence, bombings and shootings targeting police and other officials occur almost daily.
Tsarnaeva was in Dagestan as the manhunt for her children unfolded in Boston.
"Someone framed them, " he told the Russian national TV network Zvezda in Dagestan.
But as attacks against Russian targets in Dagestan have increased in recent weeks, so too have calls for tough action.
Hostages have been seized in Vladikavkaz, in North Ossetia to the west, and in Makhachkala in Dagestan to the east.
While in Dagestan, he said, Tamerlan Tsarnaev was with a family member who is believed to have been a radicalizing influence.
Dolgatov led a small group in Dagestan that had links to the main Islamist militant group in the region, Imarat Kavkaz.
Law enforcement officials and family members have identified the brothers as ethnic Chechens who had lived in Dagestan, in southern Russia.
The elder of the brothers spent several months in southern Russia last year, mostly in Dagestan but also briefly, it appears, in Chechnya itself.
Russia never reported such details to the U.S. While in Dagestan, Mr. Tsarnaev met with a known militant, officials in Dagestan said.
He would not say how long the Americans planned to stay in Dagestan, a region in the southern area of the country.
He left before picking up a Russian passport that had been prepared for him at the local migration office in Dagestan's capital.
The brothers' father, Anzor, said Tamerlan was with him while in Dagestan.
"It's all lies and hypocrisy, " she told The Associated Press in Dagestan.
President Vladimir Putin and top security officials say Russia had no meaningful information, but officials in Dagestan say Mr. Tsarnaev was tracked closely.
The meetings happened in a mosque in Dagestan's capital of Makhachkala known for its adherence to a puritanical strain of Islam, they said.
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