Israel building underground defense system on Lebanon border

Israel's military said it began construction of an underground defense system Sunday along its northern frontier with Lebanon to protect against cross-border tunnels.The infrastructure project will identify underground acoustic and seismic activity indicating tunnel digging, accompanied other defensive measures, said Lt. Col. Jonathan Conricus, a military spokesman.Israel destroyed a series of what it said were attack tunnels last year, dug under the border by the Lebanese militant group Hezboll