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    ATF: Use of tripwire suggests bomber expertise

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ATF: Use of tripwire suggests bomber expertise

The latest developments in a series of explosions in Austin suggest that city is dealing with a serial bomber, police say. CNN's Ed Lavandera reports.

ATF: Use of tripwire suggests bomber expertise

The latest developments in a series of explosions in Austin suggest that city is dealing with a serial bomber, police say. CNN's Ed Lavandera reports.