Williams spoke with the referee after hearing the alleged abuse when he was preparing to take a corner in the first half, and play was held momentarily as supporters were warned.
Turkish teenager Arda Guler's strike helped Real Madrid close in on the Spanish title with a 1-0 win at Real Sociedad on Friday, moving 14 points clear at the top of La Liga.
Laporta demanded the Spanish football federation and the refereeing committee send Barcelona all footage of the incident and audio recordings of the officials' conversations.
The coach was furious after Lamine Yamal had a shot which Barcelona said crossed the line not given as a goal after officials could not prove that it had using VAR.
The Catalan side have 68 points, seven ahead of Atletico Madrid, who visit Alaves on Sunday, and 10 clear of fifth-placed Athletic Bilbao, who drew 1-1 at home to Granada on Friday.
Barca moved to 70 points, eight behind leaders Real Madrid, whom they will face in the "El Clasico" at the Santiago Bernabeu next weekend.
Antoine Griezmann scored twice as Diego Simeone's men moved to within four points of their opponents and pulled five clear of fifth-placed Athletic Bilbao in the race for Champions League qualification.
"(Saul) entered the game well and scored a great goal," Simeone told Movistar.
A second-half header by winger Raphinha earned second-placed Barcelona a 1-0 win over Las Palmas in LaLiga on Saturday after the visitors were reduced to 10 men in the first half.
Williams spoke with the referee after hearing the alleged abuse when he was preparing to take a corner in the first half, and play was held momentarily as supporters were warned.
Turkish teenager Arda Guler's strike helped Real Madrid close in on the Spanish title with a 1-0 win at Real Sociedad on Friday, moving 14 points clear at the top of La Liga.
Laporta demanded the Spanish football federation and the refereeing committee send Barcelona all footage of the incident and audio recordings of the officials' conversations.
The coach was furious after Lamine Yamal had a shot which Barcelona said crossed the line not given as a goal after officials could not prove that it had using VAR.
The Catalan side have 68 points, seven ahead of Atletico Madrid, who visit Alaves on Sunday, and 10 clear of fifth-placed Athletic Bilbao, who drew 1-1 at home to Granada on Friday.
Barca moved to 70 points, eight behind leaders Real Madrid, whom they will face in the "El Clasico" at the Santiago Bernabeu next weekend.
Antoine Griezmann scored twice as Diego Simeone's men moved to within four points of their opponents and pulled five clear of fifth-placed Athletic Bilbao in the race for Champions League qualification.
"(Saul) entered the game well and scored a great goal," Simeone told Movistar.
A second-half header by winger Raphinha earned second-placed Barcelona a 1-0 win over Las Palmas in LaLiga on Saturday after the visitors were reduced to 10 men in the first half.
Former Brazil international footballer Dani Alves is to be released from jail pending an appeal against his rape conviction in exchange for posting bail of one million euros ($1.08 million), a Barcelona court said Wednesday.