Michael McCaul

Authorities recover new clues after another Austin blast

Investigators pursuing a suspected serial bomber in the Texas capital faced new threats along with the promise of valuable new leads as their attention shifted Tuesday to a FedEx shipping center near San Antonio where a package exploded and the discovery of another, unexploded bomb near Austin's airport.

Even as they pored through surveillance video footage and collected evidence hoping to get closer to tracking down whoever is behind the series of blasts that have killed two people and seriously wounded four others, a Tuesday night scare caused them to respond to a Goodwill store in southern Austin. It turned out to be an unrelated explosion: Someone dropped off a device sometimes...