The arrests were made by police investigating a group dressed as members of the Ku Klux Klan.
A report of a group dressed as Ku Klux Klan members in Newtownards is widely condemned.
The air ambulance attended the scene of the crash on the Portaferry Road near Newtownards.
Two people were taken to hospital following the crash near Newtownards, County Down.
Fifteen passengers are treated at the scene and a number are taken to hospital following the crash.