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Karen Anderson of CBS affliate WBZ-TV reports that two of the suspects are Azamat Tazhayakov and Dias Kadyrbayev, college students who knew the younger Boston bombing suspect Dzhokhar Tsarnaev at UMass Dartmouth.
Tazhayakov and Kadyrbayev were photographed with Dzhokhar Tsarnaev in Times Square during a trip he made to New York City in 2011, both are from Kazakhstan and had appeared in court last Wednesday for a visa violation. A lawyer for the pair says that both plan to plead "not guilty", according to Yahoo News.
Reports from NBC suggests Tazhayakov and Kadyrbayev may have been arrested because they "helped take things out of Tsarnaev's dorm room after the bombings," but that there is "no evidence they particpated in planning" of the bombings.
Another report from Reuters says that are "investigating if classmates threw away some kind of knapsack at request of Boston Marathon bombing suspect Tsarnaev."
The third suspect is an unnamed American citizen who will be charged with making a false statement, according to CBS.
The suspects were arrested for "harboring or aiding the suspects after the fact" and that they are in the custody of the FBI, according to CBS.
In an additional statement the Boston PD added that, "please be advised that there is not a threat to public safety."