Note: The article has been updated with new information.

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A semi-truck overturned on I-44 North in Oklahoma City.
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The location of the crash, according to Oklahoma Highway Patrol.

UPDATE: I-44 is fully reopened to traffic.

OKLAHOMA CITY (KFOR) – A section of Interstate 44 North in Oklahoma City is down to one lane following a semi-truck crash Tuesday night.

Both lanes of I-44 North at around SW 65th Street were initially closed. However, one lane has since been reopened, according to an Oklahoma Highway Patrol official.

A semi-truck hauling transformers overturned in the northbound lanes, blocking traffic.

Chemicals spilled out from the rig. A HAZMAT crew was called to the scene to clean up the spill.

The driver of the semi was up and walking around after the crash, but was later transported to a hospital for treatment.

This is a developing situation.