Related: Terrorism

1. More world news
   1. Man killed in London street in possible terror attack
   2. Iran bars 2 leading candidates from presidential vote
   3. Sweden stunned by third night of rioting
   4. Ai Weiwei records profanity-laced heavy metal song
   5. Costa Concordia captain faces trial over deadly wreck
2. More top stories
   1. FBI agent kills man linked to Boston bombing suspect
   2. Names of tornado victims released by medical examiner
   3. Lawmakers grill officials for inaction on IRS, Lerner denies wrongdoing
   4. Chaos and courage in wrecked elementary schools
   5. 'Tornado Mom' to Okla. victims: 'You will rebuild'
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