Friend of Boston Marathon suspect denies charges

A friend of Boston Marathon bombing suspect Dzhokhar Tsarnaev has pleaded not guilty to charges of trafficking heroin and possessing an illegal handgun in connection with the April 2013 bombings.

Stephen Silva, 21, of Cambridge, appeared in federal court in Boston to waive his right to a detention hearing. He has been in custody since his arrest last July. His next court date is October 8.