A 15-year-old girl in Chicago was reportedly recently sexually assaulted by “five or six men or boys on Facebook Live,” according to the Associated Press

This is the second such reported attack in Chicago that was broadcast on Facebook this year alone. In January, four teens were arrested in connection to a torture video. The Chicago Tribune reported Tuesday that this attack marks "at least the fourth Chicago crime caught on Facebook Live since the end of last October."

Tuesday afternoon, Anthony Guglielmi, a police spokesman, tweeted that the new investigation was moving forward.

UPDATE: CPD making good progress identifying persons of interest in 10th Dist assault. Interviews ongoing but no formal suspects named yet — Anthony Guglielmi (@AJGuglielmi) March 21, 2017

Guglielmi told the AP that the department found out about the assault on Monday when a woman approached Superintendent Eddie Johnson as he was leaving a station in the Lawndale neighborhood on Chicago's West Side. She showed him screen grabs from the video and said that her daughter had been missing since Sunday.

The Tribune quoted an e-mail from Guglielmi, saying that Johnson was "was visibly upset when he saw the pictures of the girl and was dismayed when he learned that people were watching the incident live and no one called police."

Johnson ordered an investigation immediately and asked Facebook to remove the video. Facebook complied.

According to the AP, 40 people watched the video. Guglielmi also told the news agency that the girl has since been found and returned to her family. So far, no suspects have been named and no arrests have been made.

Citing a local alderman, the Tribune also reported that one person had been arrested, but Guglielmi denied Tuesday evening that was the case.