Samoan 7s player Gordon Langkilde has been suspending with police investigating the tunnel clash
The incident occurred in the tunnel after Wales’ Rugby World Cup Sevens win over Samoa on 22 July in the United States.
San Francisco Police confirmed Langkilde had been arrested “on the charges of Aggravated Assault (felony) and Battery Causing Serious Bodily Injury”.
The WRU also confirmed Williams’ injuries.
Langkilde was booked into San Francisco County Jail, a police statement confirmed. It has also been confirmed that an “active and ongoing investigation” has taken place.
The police statement issued confirmed reports three Wales players were hurt during the tournament but says Langkilde is accused of assaulting two players.
The incident took place in a tunnel leading from the playing field to the locker room area.