Austin tense after fifth bomb in a month

The US state of Texas is on tenterhooks after a fifth explosion in a month - the latest happened overnight at a Fed Ex parcel distribution warehouse in San Antonio - mildly injuring one person. Police believe a serial bomber is behind the attacks that have killed two people. The first three were in parcels left on people's doorsteps, but the fourth was left on a residential street and was triggered by a trip wire. Chief Brian Manley of the Austin, Texas Police Department, says they think the explosions are connected. US correspondent Kate Fisher tells Todd Niall the latest details.