An angry Texas crowd has beaten and killed a 40-year-old car passenger after a driver injured a young girl near the site of a busy local festival.

Police said the driver of the car stopped to check on the health of the girl, said to be aged three or four.

But when the passenger got out to see how she was, he was set upon by a group of up to 20 people before being left lying in a car park, police said.

The girl was hit at low speed and was not seriously injured.

The incident happened near Austin, Texas, as crowd of between 2,000-3,000 people gathered for the annual Juneteenth festival, which commemorates the freeing of American slaves.