Company director Alexian Lien was dragged from his 4x4 in front of his wife Rosalyn and their two-year-old child after colliding with a motorbike on Sunday during a bike rally.
Mr Lien, who works for British online payments company Moneybookers and was previously based in London before relocating back to the U.S., had been pursued by up to 30 angry bikers before being attacked.
Police have said Mr Lien
, 33, is not expected to be charged, but the investigation is continuing and they are seeking information about the other bikers involved.
told them he
"accidentally collided with one" after they had been riding "erratically" and he
fled as he
feared for his