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Accident is reported to have happened in May, and reported to NHTSA/DOT immediately by Tesla. But not public until the end of June -- something a bit fishy about this reporting lag.
On the other hand, the accident is described as one that might have also been difficult for an alert human to have avoided --
The May crash occurred when a tractor trailer drove across a divided highway, where a Tesla in autopilot mode was driving. The Model S passed under the tractor trailer, and the bottom of the trailer hit the Tesla vehicle's windshield.
"Neither Autopilot nor the driver noticed the white side of the tractor trailer against a brightly lit sky, so the brake was not applied," Tesla wrote.
This was the first reporting found--by the time it makes the SN front page there may be more details. Because this is a "first" it seems likely that a detailed investigation and accident reconstruction will be performed, perhaps by NTSB who investigate airline accidents?