SANTA ANA (CBSLA) — Authorities say four people were killed in a fiery crash in Santa Ana overnight Sunday.

The crash unfolded near 4th Street and Tustin Avenue just after 2:30 a.m., and resulted in one vehicle bursting into flames.

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The impact of the crash was so strong both the truck and the Jeep overturned.

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Officers say one person was rushed to the hospital in critical condition.

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The area remains closed as investigators continue to search the scene.