Officially Barça sent them 5,000 tickets, although they had requested 35,000, and many were able to access the home end to witness their side's historic 3-2 win.
"Xavi is right, this was a serious mistake," Laporta said. "What happened in the stands is a disgrace that cannot be repeated.
"We have to review the information we have and take measures. It's lamentable. We have to be stricter and not allow certain things. I feel ashamed as a Barcelona fan. I apologise. We're processing the information and will give explanations."
On the game, Laporta added: "We were not able to win and we have to accept it. In football, these things happen. We're sad, angry, but we have to look forward and fight for LaLiga."
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