A deadly strike on a UN peacekeeping base in southern Lebanon has left one peacekeeper dead and two others injured, underscoring the mounting danger surrounding the mission as violence intensifies across the border region. "A UNIFIL peacekeeper died early this morning from critical injuries sustained when mortar shells struck his position," the force said in a statement, adding that an investigation is now under way. Serbia's defence ministry said the peacekeeper was Serbian and stated that he died from injuries suffered in…