John Burnett

Over the past three weeks, Austin watched in horror as a methodical madman detonated one shrapnel bomb after another in this seeming laid-back oasis. An unemployed 23-year-old loner killed two people and injured four others, before blowing himself up early the morning of March 21 as police closed in.

As an army of federal investigators packed up and left town, the city's quirky civic slogan, "Keep Austin Weird," took a blow.

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More than 500 investigators and bomb techs have streamed into Austin, Texas, to look for clues and to catch what they're now calling a "serial bomber."

Five explosions have killed two people and injured several more, one gravely.

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