On March 5, between 9 a.m. and 7 p.m. in some parts of California, Utah, and Wyoming, a “cyber event” caused the interruption of energy grid operations, according to a Department of Energy report first uncovered by E&E News.

The report is cryptic at best, and the Department of Energy has not responded to a request by Motherboard for more information about the incident. A “cyber event,” according to infrastructure hacking experts, could be anything from hackers messing with the grid remotely, to a much less dramatic hardware or software bug.

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