And exactly one year before Pimentel 's arrest , Taimur Abdulwahab al-Abdaly flew to Sweden from England . Boston Marathon bombs seem to follow widely available recipe , experts say . Score: 6 Al Qaeda , U.S. right-wing extremists use hard-to-trace bombs , experts say .
Boston Marathon bombs seem to follow widely available recipe , experts say . Score: 6 Al Qaeda , U.S. right-wing extremists use hard-to-trace bombs , experts say .