A picture began to emerge Wednesday of a highly complex attack carried out by Israel, after thousands of pagers carried by members of Lebanese militant group Hezbollah exploded around the same time a day earlier. Many of the affected pagers were from a new shipment that Hezbollah had received recently, part of a nearly yearlong process to swap out older devices. The group said they detonated in rough unison at 3:30 p.m. Survivors reported hearing the pagers beep and...