A grateful Virginia mother has taken to Facebook to thank a white state trooper who helped her black son with a flat tire late at night - and her post has since been shared more than 20,000 times.

Dr Nada Owusu wrote that her son Joseph, a Virginia Tech student, was on his way home from school last Thursday when his back tire blew out 'in the middle of nowhere'.

She said her 20-year-old son was then approached by Virginia State Trooper Matt Okes, who she noted didn't ask Joseph if the Mercedes was stolen but instead 'got on his knees to replace his tire.'

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Dr Nada Owusu took to Facebook to thank State Trooper Matt Okes for helping her son Joseph with a flat tire late at night, writing that he didn't ask Joseph if the Mereceds was stolen in the post

Grateful: Pediatrician Dr Nada Owusu praised the actions of Virginia State Police Trooper Matt Okes for stopping to help her son when his tire blew out at night on a rural stretch of highway

When he realized the tire was stuck, Okes stayed with Joseph for hours until both the student's parents and AAA arrived to help, Owusu wrote.

And as they waited Okes made sure to shine the lights of his cruiser on Joseph's car to help warn oncoming trucks and other vehicles, according to WTVR.

Owusu, a pediatrician who emigrated from Ghana and now works in Danville, Virginia, called Okes 'our hero.' She said the trooper even drove behind the family after they returned to the road.

The post has since gone viral, even catching the attention of television host Montel Williams, who told Owusu he was grateful she had shared Okes act of heroic kindness with the world.

'Too often we look at very specific instances where police miss the mark,' he wrote.

Owusu wrote that Okes got on his knees to replace Joseph's tire and, when he realized it was stuck, stayed with her son for hours, shining the lights of his cruiser on the car to warn oncoming vehicles

Owusu said she was grateful that there was a 'good person' waiting with her son. 'I didn't care if he was green, blue, yellow,' she said. 'There's a lot of good in America and that needs to be heard'

Talk show host Montel Williams weighed in to praise Dr Owusu for sharing the story about her son and the state trooper

'And it's equally if not more important to recognize the countless Trooper Okes of the world who quietly serve with distinction and embody everything we want our police to be.'

Owusu said she believed there was a lot of 'good in this world,' adding that people 'want to hear positive stories'.

'As far as I was concerned, there was a good person waiting with my son,' she said.

'I didn't care if he was green, blue, yellow. There's a lot of good in America and that needs to be heard. Police need our support.'