Plane went down off Brazil on June 1 , killing all 228 aboard . The cause of the crash was not immediately clear and investigators are still trying to determine what caused it. Investigators planned to keep listening for 10 additional days . French oceanographic ship will conduct new searches .
Plane went down off Brazil on June 1 , killing all 228 aboard . Voice , data recorders stop broadcasting after 30 days . Investigators planned to keep listening for 10 additional days . French oceanographic ship will conduct new searches .