Joseph Parker left] with brother John Parker [Source: Photosport]

The brother of heavyweight boxer Joseph Parker has been detained in Chicago following an alleged assault at O’Hare International Airport.

It is understood John Parker, a former professional boxer, allegedly attacked at least one member of the public after he was removed from a Chicago to Los Angeles flight due to a ticketing issue.

He was in transit returning from his brother’s victory against Alex Leapai on Sunday in Providence, Rhode Island.

It is believed John has since been released by police to family members but it remains unclear whether he faces any charges.