In other news Monday, two suicide bombers attacked a meeting of anti-Taliban officials and tribesmen in northwest Pakistan, killing 50 and wounding more than 100. This was the third attack this year on a tribal militia meeting.

At least 13 car bombs and roadside blasts exploded in Shiite neighborhoods across Baghdad, killing 76 people.

Author Beverly Gage discusses her book, "The Day Wall Street Exploded," which examines the fallout from a 1920 bomb attack that killed dozens of people and wounded scores more during lunch hour on Wall Street.