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    Police: Tripwire may have triggered explosion

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Police: Tripwire may have triggered explosion

An explosion that injured two men Sunday night -- marking the fourth blast in Austin, Texas, in a month -- could have been triggered by a tripwire, according to Austin Police Chief Brian Manley.

Police: Tripwire may have triggered explosion

An explosion that injured two men Sunday night -- marking the fourth blast in Austin, Texas, in a month -- could have been triggered by a tripwire, according to Austin Police Chief Brian Manley.