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    Austin mayor urges caution after 4th explosion

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Austin mayor urges caution after 4th explosion

Austin, Texas, Mayor Steve Adler tells CNN's John Berman that an "army of investigators" are on the scene after a fourth explosion in the city.

Austin mayor urges caution after 4th explosion

Austin, Texas, Mayor Steve Adler tells CNN's John Berman that an "army of investigators" are on the scene after a fourth explosion in the city.