Houston Police say a brave little boy helped save his younger brother after a fiery crash killed their dad on Interstate 45 early Friday.

Police say the dad lost control of his family's moving truck for unknown reasons. He struck a barrier and then a concrete pillar, flipping the truck. The father was ejected from the truck and died at the scene as the wreckage.

His two young boys, a 5-year-old and a 2-year-old, were in the truck when the crash occurred.

Officers said the 5-year-old boy wasn't seriously hurt and was able to tell police what happened.

“The 5-year-old actually advised us that he pulled his 2-year-old little brother out from the 18-wheeler wreckage,” said Sgt. James Roque. “The 2-year-old did have some severe burns to his body, but he’s at Memorial Hermann and they’re saying he’s expected to be okay.”

The older brother said their mom was driving an R.V. in front of them but kept going, apparently unaware there was a crash.

PHOTOS: Fiery crash on I-45 N. kills 1

By Friday evening, police still hadn't been able to locate the mother.

The Galveston-bound 18-wheeler belongs to United Van lines, a moving company that required their contracted drivers to have a class A commercial driver's license or CDL.

"They were moving to Galveston, so it appears the father was driving -- not an employee of the moving company," said HPD Sgt. James Roque.

A United spokesperson couldn't confirm the father was a contracted driver.

The crash was first reported around 1:20 a.m. just inside Beltway 8, shutting down in the inbound lanes for several hours. The freeway mainlanes reopened shortly before 6 a.m.

Research group Value Penguin just did an analysis that ranked I-45 as the second most dangerous road in America. Their study says there are nearly 57 fatal accidents per 100 miles of interstate on I-45 -- and that the Houston stretch is the most dangerous.

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