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Terence Crawford was forced out of a car at gunpoint by a police officer with the tense exchange caught on video ... and, it's leading to an internal investigation.

Video is circulating online showing the boxer slowly unbuckling his seatbelt, opening his door and stepping out of the car ... while an officer at his window holds a flashlight in one hand and a gun in the other.

The officer repeatedly tells Crawford to step out ... and, he replies at one point, "I ain't reaching for no gun" -- with his hands up the whole time.

Crawford was then patted down by the officer before the clip comes to an end. Getty

The Omaha Police Department released a statement Sunday morning ... explaining the city's mayor and chief of police are ordering a review of the traffic stop by

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