Investigators say Texas 'serial bomber' may have used tripwire in latest blast

Officials work Monday near the site of the latest explosion in Austin. Police warned nearby residents to remain indoors overnight as investigators looked for possible links to other deadly package bombings elsewhere in the city this month.
Officials work Monday near the site of the latest explosion in Austin. Police warned nearby residents to remain indoors overnight as investigators looked for possible links to other deadly package bombings elsewhere in the city this month.