The body of Boston Marathon bombing suspect Tamerlan Tsarnaev is being claimed, say US authorities.
The attorney for Dias Kadyrbayev has said that he denies helping Dhzokhar Tsarnaev cover his tracks.
The FBI have issued a photo of fireworks found in Dzhokhar Tsarnaev's dormitory room.
According to court papers, suspects Azamat Tazhayakov and Dias Kadrybayev destroyed and concealed Dzhokhar Tsarnaev's backpack and laptop computer.
The charges say that the suspects decided to conceal the items after learning he was a suspect in the Boston Marathon Bombing.
The three men arrested in the Boston Marathon bombing investigation are to be charged with conspiring to obstruct justice and making false statements, according to a US attorney.
The roommates of Dzohkhar Tsarnaev will be charged with lying to investigators after they allegedly removed items from the bombing suspect's dormitory room and then denied doing so, sources told NBC News.
Massachusetts Governor Deval Patrick said he has been told that the three suspects arrested had no role in the bombings but were charged for crimes after the marathon, according to the Boston Globe.
The Governor added that the three suspects would be arraigned later today, the newspaper added.
Two of the three people taken into custody in connection with the Boston Marathon bombings are citizens of Kazakhstan, a law enforcement source told Reuters.
The third person taken into custody is believed to be a US citizen and all three were being investigated for actions taken after the April 15 bombings, the news agency added.
It was reported that the two Kazakhstan citizens had previously been held by US immigration officials on suspicion of violating terms of their visas.
All three are believed to have been college classmates of bombing suspect Dzhokhar Tsarnaev.
A law enforcement source has told Reuters that two people in custody in the Boston Marathon bombing case were college classmates of Dzokhar Tsarnaev, and could face criminal charges.
The source also told the news agency that the third person in custody is a US citizen, and that authorities are investigating whether classmates through away some kind of knapsack at the request of Tsarnaev.
Two of Dzhokhar Tsarnaev's roommates were arrested on charges of making false statements to investigators and conspiracy to obstruct justice, according to CNN.
It was also reported that the two students are from New Bedford, Massachusetts.