Federal investigators have confirmed that a West Texas prison bus accident that killed two prison guards and eight inmates was caused by the bus striking a piece of displaced highway guardrail.
The National Transportation Safety Board in a report released Wednesday said the bus lost control Jan. 14, 2015, when it struck the damaged guardrail along a bridge on Interstate 20 west of Odessa.
The bus left the highway, became airborne and fell about 20 feet before striking a Union Pacific freight train that happened to be passing beneath the highway.
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Icy road conditions had earlier caused other vehicles to wreck in the area, including one accident that had caused the guardrail to become dislodged.
The NTSB last year released a preliminary finding that the guardrail contributed to the wreck.