Continuing on the "5" theme, here's a must-include UPDATE from the WSJ:
Tamerlan Tsarnaev is the fifth person since 9/11 who has participated in terror attacks after questioning by the FBI [emphasis added]. He was preceded by Nidal Hasan; drone casualty Anwar al Awlaki; Abdulhakim Mujahid Muhammad (born Carlos Leon Bledsoe), who murdered an Army recruit in Little Rock in June 2009; and David Coleman Headley, who provided intelligence to the perpetrators of the Mumbai massacre in 2008. That doesn't count Abdulmutallab, who was the subject of warnings to the CIA that he was a potential terrorist.
Al Qaeda Operative Who Nearly Bombed UK Shopping Mall, NYC Subway Sentenced to 40 Years in Prison | Katie Pavlich