UPDATE: WWE tweeted out the following updates earlier this afternoon:
The following is from WWE.com:
In the final moments of this week’s SmackDown LIVE, Roman Reigns was intending to make a SummerSlam challenge from the backstage area, but The Big Dog just barely evaded sheer catastrophe when tons of steel beams came plummeting toward him.
A preliminary investigation has found the incident Tuesday night involving Roman Reigns was caused by a forklift backstage carrying lighting grids that were not properly secured.
Update to story – 10:40 a.m. ET It has now been determined that the incident in question was specifically caused by a forklift driver error.
Update to story – 12:10 p.m. ET At this point, the identity of the forklift driver has not been determined.
Check back with WWE.com for more details as they become available.