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French authorities backed off a claim that a 22-year-old man was connected to beheadings in a recent ISIS video, a day after publicly identifying him, CNN reported.

A spokeswoman for the Paris prosecutor's office on Thursday distanced the agency from a news release put forth by her office that identified Mickael Dos Santos as the second French national believed to be an ISIS terrorist.

"We stated yesterday on precise and concurring clues about his identity. We never talked about formal identity. The investigation is still ongoing," spokeswoman Agnès Thibault-Lecuivre told CNN's Laura Akhoun. She declined further comment.

Dos Santos, according to the prosecutor's office, remains wanted on a October 2013 warrant as part of an investigation into French citizens who had gone to Syria to fight with ISIS.

The announcement leaves just Maxime Hauchard, who authorities said Monday was in the video, released over the weekend, that depicts in graphic detail the beheadings of men whom ISIS militants claim were Syrian government pilots.

It also shows the aftermath of another beheading in which the victim in not clearly recognizable, but that the U.S. government says was American aid worker Peter Kassig.

Public Prosecutor Francois Molins described Hauchard -- who went to Syria in 2013 and visited Mauritania the previous year -- as a "self-radicalized" jihadist who traveled to the region under the guise of a humanitarian mission. He was known to French security services as far back as 2011, the prosecutor said.