Tsarnaev Formally Charged With WMD Use
NBC's Pete Williams breaks down charges brought against Boston Bombing suspect
Boston Attack Casts Shadow Over Immigration Debate
Senators clash at hearing over terror's impact on immigration reform
Williams: Carjacking Victim Called Bombing Suspects 'Cautious But Brutal'
Victim says he escaped Tsarnaev brothers at gas station, lived because he's not American
Inspector Romero Says Coast Is Clear
ACLU official mighty confident despite the many questions that remain in Boston bombing