Thousands of documents have been released from the investigation into the Fern Hollow Bridge collapse. There is still no word on the cause.
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The NTSB released over 2000 pages of reports and data.
Information ranging from weather data to work orders and testing.
Investigators also say they have recently produced 3D scans of certain portions of the bridge's superstructure, performed testing on material collected following the collapse, conducted interview and examined similar bridges.
The latest update did not answer perhaps the biggest question about the collapse, what caused it.
This weekend will mark one year since the incident.