Spanish Influenza breaks out, Janet Reno is confirmed as the first female attorney general, and a massive earthquake and tsunami cripple Japan, all on this day.
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Andrea Comas/Reuters
2004: Simultaneous explosions on four rush hour trains in Madrid, Spain, kill 191 people and wound 1,800 more. The official investigation found that the attacks, which came three days before Spain's general elections, were directed by an al-Qaeda-inspired terrorist cell. A total of 21 people were found guilty on a range of charges from forgery to murder for their roles in the attacks.