Two Northlake Police officers were working a wreck on Thursday morning when they were struck by an 18-wheeler semi-truck.

According to a FOX 4 News report, authorities said the crash happened around 9 a.m. on February 24 on Highway 114 near Texas Motor Speedway.

That day, drivers faced slick roads due to the winter storm that that had iced area roadways. According to Northlake Police Chief Robert Crawford, the road conditions undoubtedly contributed to the crash, but an investigation is ongoing to determine the exact cause of the accident.

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Officials say that the driver of an 18-wheeler lost control of the truck. The trailer then jackknifed and hit two Northlake Police SUVs and a pickup truck.

Three people in total were taken to area hospitals. All of the injured were inside their vehicles at the time of the crash, a factor that police say likely saved their lives, Fox 4 reports.

Northlake Police said that officer Thomas Martinez, 47, was pinned under the trailer. He was extricated from his vehicle and taken to a hospital in critical condition. Police say he is now in stable condition but will remain in the hospital for observation.

Police say another officer, Matthew Koeper, 38, was treated for minor injuries and released.

The female driver of the pickup truck was not seriously hurt. The driver of the 18-wheeler walked away from the crash.