It happened on US-290 near Barker Cypress and Skinner Roads just before 1 a.m.
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The METRO police officer arrived to the scene of an earlier crash and was diverting traffic in the westbound lanes of the freeway, authorities said.
Less than three minutes after arriving, another car collided into the METRO cruiser.
The officer involved was transported to a hospital, but METRO did not release details on their injuries. The officer was treated and released, METRO said.
The main lanes were closed for several hours Friday morning.
The driver who crashed into the police cruiser was believed to be under the influence and faced DWI charges. Their name was not released.
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