Bomb suspect pals plead not guilty

Two friends of Boston Marathon bombing suspect Dzhokhar Tsarnaev pleaded not guilty in federal court to charges of conspiracy to obstruct justice and obstructing justice with intent to impede authorities.

Dias Kadyrbayev and Azamat Tazhayakov, who were handcuffed, both voiced their not guilty pleas during their brief arraignment yesterday in Boston.

The 19-year-old roommates and Kazakh nationals began attending the University of Massachusetts-Dartmouth the same semester as Tsarnaev. They were arrested in May with Robel Phillipos, another one of Tsarnaev’s friends.