Khairullozhon Matanov, a legal resident of the US originally from Kyrgyzstan, destroyed, altered and falsified records in a federal investigation, and made false statements in a federal investigation, federal prosecutors said.
Matanov, 23, is not accused of participating in the bombings or of knowing about them in advance. He is scheduled to appear in US District Court in Boston.
His lawyer, Paul Glickman, did not immediately return a phone message left today morning at his office. Matanov's phone number could not immediately be located.
He talked to the brothers on numerous occasions after the bombings, and even took them out to dinner the day of the explosions, they said.
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"In the days following the bombings, Matanov continued to express support for the bombings, although later that week he said that maybe the bombings were wrong," the indictment said.
He tried to contact the brothers after he saw media reports identifying them as the suspects, prosecutors said. Matanov deleted information regarding the brothers from his computer, including Internet searches, they said.
And he repeatedly lied to investigators about the extent of his friendship with the Tsarnaev brothers, prosecutors said.
The brothers, ethnic Chechens who lived in the former Soviet republic of Kyrgyzstan and the Dagestan region of Russia, settled in the United States more than a decade ago.
According to the indictment, Matanov, who worked as taxi driver among other jobs, became friends with Tamerlan Tsarnaev after coming to the US in 2010. The indictment said the two discussed religion and hiked up a mountain in New Hampshire in order to praise and emulate the training of the mujahedeen.