Serial bomber hunted in Texas Investigators believe a serial bomber is behind the attacks in Austin, Texas, after the explosion of a fifth device. The blasts have killed two people and injured several others Mar 2: Parcel bomb left on front porch kills Anthony Stephan House, 39 Mar 12: Draylen William Mason, 17, killed after bringing package inside home. Explosion also critically injures his mother Mar 12: Hispanic woman, Esperanza Morena Herrera, 75, injured by another package Mar 18: Two men in their 20s injured by device on side of road, possibly activated by tripwire Mar 20: One person lightly injured after package destined for Austin address blows up at FedEx depot. FBI investigating possible link to other four bombs AUSTIN SAN ANTONIO 1 2 3 4 5 35 10km 6 miles TEXAS 320km 200 miles Source: Austin Police Department Pictures: FBI © GRAPHIC NEWS