LONG BEACH (CBSLA.com)  – Hundreds of Long Beach residents are suffering through another round of power outage in the midst of a heat wave.

The lights went out Tuesday evening in the Delta Avenue area near Silverado Park.

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City officials say 1,400 residents lost power around 6 p.m.  Around 900 are still in the dark as of 11:45 p.m., according to Southern California Edison.

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It’s not clear what caused Tuesday night’s outage.

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Most of the electricity is expected to be restored overnight.