Williams, who joined Swansea on a season-long loan on deadline day, made his second appearance for the Championship club as they fought back from 3-0 down to seal a point.
It was a memorable afternoon for the 20-year-old centre-back as Jamie Paterson, Oliver Ntcham and Joel Piroe scored in the second half, but not wholly for the right reasons.
In a statement on Saturday evening, Swansea confirmed an allegation of racist abuse towards Williams from a Luton supporter in the closing stages of the draw:
“Towards the end of today’s Championship fixture against Luton Town at Kenilworth Road, an allegation of racial abuse was made over comments made towards Swansea City’s Rhys Williams from a home spectator.
“An official report was filed with the match official, Tony Harrington, and Bedfordshire Police at full-time.
“Swansea City condemns racism and abuse of all kinds because it has no place within football or any walk of life.”
Swansea revealed that Bedfordshire Police were investigating the incident, with both Liverpool and the player’s loan club providing support in the aftermath.
“Rhys has the full backing of everyone at the football club,” Swansea added.
“We are in dialogue with his parent club Liverpool with regards to ensuring the player has all the support he needs.”
Manager Russell Martin has described the situation as “disgusting” and “repulsive,” while Luton reiterated their “zero tolerance policy on discrimination of any kind,” vowing those responsible “will not be welcome back at Kenilworth Road.”