French and German leaders are visiting the site of the Germanwings plane crash in the French Alps, as investigators hope to glean clues from the voice recorder in the plane's damaged black box. French President Francois Hollande and German Chancellor Angela Merkel were arriving in the area Wednesday to meet with search and recovery crews. Attention has turned, meanwhile, to the black box recovered from the plane — it's damaged but could help investigators determine what caused Flight 4u9525 to descend for eight minutes before crashing, likely killing all 150 people aboard, an official said. "The scene is not like a normal crash," a rescue helicopter co-ordinator said. "We normally find big pieces; there are lots of little pieces. There are no wings; no cockpit. Nothing." Meanwhile, Germanwings said there were "occasional flight disruptions" within its network due to "crew members who decided not to operate aircraft" following the crash.