New York motorbike rally incident investigated
2 October 2013 Last updated at 07:17 BST
An investigation is under way after a rider and a motorist were injured in a confrontation during a motorbike rally in New York.
Police say they are looking into what started the incident - which saw a large group of bikers chase the car after it allegedly ran down members of the rally who had stopped, blocking the road.
Edited footage of the incident was put online anonymously.
Verity Wilde reports.