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MEMPHIS, Tenn. — A tractor-trailer wreck blocking the northbound lanes of the I-55 bridge into Arkansas caused police to shut the bridge in both directions Wednesday morning.

At 6:34 a.m., Memphis Police said the bridge was back open, after it was closed for about 20 minutes for an investigation of the crash.

More: WREG traffic map →

The I-40 bridge’s westbound lanes just reopened to traffic Monday after being shut for repairs for three months.