BISMARCK, N.D. (AP) — Officials have reopened part of Interstate 90 in southern South Dakota, but travel remains difficult in much of the Dakotas due to a snow storm that also has caused power outages and school closures.

The eastbound lanes of I-90 remain closed from Rapid City to Chamberlain, but the westbound lanes have been reopened from Wall to Rapid City.

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No travel is advised in most of western South Dakota. Travel alerts are in place in northeast and central North Dakota.

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Many schools in the two states are closed or starting late.

In North Dakota, the Mor-Gran-Sou and Verendreye Electric cooperatives are working to restore electricity. At least 3,500 customers were affected Tuesday. The co-ops pulled restoration crews for safety when it got dark, with plans to continue work after dawn.

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