Facebook Drone Failure Prompts a U.S. Investigation

Facebook may have been beaming with pride when it  of its Aquila internet drone on June 28, but that "structural failure" near the end? U.S. officials aren't so happy about that.

The National Transportation Safety Board has  that it's investigating the incident, which it considers "substantial" enough to be treated as an accident. The exact circumstances aren't available, but there wasn't any damage on the ground.