MODESTO (CBS13) — Authorities say vandalism to an electrical substation caused a widespread power outage in northwest Modesto on Thursday morning.

According to the Modesto Irrigation District, the substation on Prescott Road was vandalized.

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It’s unclear how many people suffered a power outage, but MID says most have been restored.

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Exactly what kind of damage was done to the substation is unclear.

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The power outage also caused the traffic lights at several intersections to stop working, police say. Drivers are reminded to treat intersections where lights aren’t functioning as four-way stops.