Boston Marathon bombing suspect Dzhokhar Tsarnaev pleaded not guilty Wednesday to 30 federal counts related to the April 15 attacks. Tsarnaev appeared in a federal courtroom in Boston on Wednesday for an arraignment in the April 15 bombings, which killed three spectators and wounded about 260, and the slaying of a Massachusetts Institute of Technology police officer three days later.
He faces a total of 30 counts in connection with bombings and a police chase that left his brother, Tamerlan, dead.