BOSTON - Two friends of Boston Marathon bombing suspect Dzokhar Tsarnaev pleaded not guilty Tuesday in federal court to charges of conspiracy to obstruct justice and obstructing justice with intent to impede authorities.
Dias Kadyrbayev and Azamat Tazhayakov, both 19-year-old natives of Kazakhstan who had been studying in the United States, voiced their not guilty their pleas during their brief arraignment in Boston.
They'd been arrested on May 1 along with Robel Phillipos, another friend of Tsarnaev.
Tsarnaev had been taken into custody days earlier in Watertown, Massachusetts. He and his brother -- who died following a confrontation with police -- are accused of planting two bombs near the Boston Marathon finish line that killed three people.