That's a big reason why a trio of package bombs in the heart of Texas has challenged investigators and terrified a city of almost 1 million people. CREDIT: Ricardo B. Brazziell/Austin
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5 bombs, many questions: What we know about the Texas explosions
Now we know the explosions could strike anyone. The fourth Austin bombing in less than a month was detonated by a tripwire along a residential street, police said -- prompting fears that any pedestrian could become the next victim.
Austin explosion may have been triggered by tripwire, police say
An explosion that injured two men Sunday night could've been triggered by a tripwire, said Austin Police Chief Brian Manley, after a fourth blast in the Texas city in little over two weeks.
3 bombs, many questions: What we know about Austin box explosions
In these attacks, it's unclear if the victims were targeted or picked at random.
