At least five women were attacked in mob sexual assaults in Tahrir Square Sunday night, as thousands gathered to celebrate the inauguration of Egyptian President Abdel Fattah al-Sisi.

"Unfortunately we are now witnessing another wave of sexual harassment. We don't have accurate numbers to report but we can say many women, at least five we know about, were attacked by mobs last night," said Heba Mohamed, who works with the Egyptian group "I Saw Sexual Harassment," which catalogues attacks on women.

In at least three of the cases last night, the women were badly injured and remain in the hospital. She said that the group was still collecting data about what happened over the weekend, and did not know the total number of women attacked.

Egyptian television stations, which initially did not report the attacks, were eventually forced to comment when a video surfaced online showing one attack in brutal detail. Few, however, provided any details, and were quick to blame Muslim Brotherhood supporters, who they said wanted to ruin the happy occasion of Sisi's inauguration by attacking women.

In one clip, a correspondent from the Tahrir Channel is shown speaking to news anchor Maha Bahnasy live from the square. The correspondent said that there have been isolated cases of harassment, and Bahnasy, audibly laughing, replied the boys were "having a good time."