Austin on edge after explosion leaves 2 injured; cause of blast unclear

Another Austin explosion -- possibly triggered by a trip wire -- injured two people on bicycles Sunday night, leaving police frantically working to determine if the blast is linked to a trio of package bombings that have gripped the Texas capital in fear. The latest blast occurred around 8:30 p.m. Sunday night in a suburban neighborhood known as Travis Country. Investigators didn’t immediately confirm what caused it. -- More..