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Update 8 am:

Tennessee Highway Patrol has reopened all southbound lanes in Anderson County following semi fire near the Norris exit at mile marker 121.

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(WBIR) A tractor trailer fire has shut down I-75 southbound in Anderson County.

The Tennessee Highway patrol says all southbound lanes near the Norris exit at mile marker 121 will be closed until about 8 a.m. as crews extinguish the fire in the semi. Troopers are diverting southbound traffic to alternate routes.

A trooper said no cargo was on-board the semi, and no one was hurt in the crash.

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