The FBI is asking the public for help in identifying a man seen in an online video engaging in sexually explicit activities with a young boy. The video was reported to the National Center for Missing & Exploited Children in 2012 after it was found in the collection of a San Francisco man arrested on child pornography charges.

The man, dubbed "John Doe 28" by the FBI, may not necessarily be linked to the Bay Area, but FBI officials believe he is a U.S. Citizen because he can be heard saying "careful" in the video. By circulating the man's photo, the Bureau hopes someone will come forward to identify him and help find the exploited child.

“Subjects who show their faces in child pornography are not typical,” Special Agent Karen Jurden said in a release. “It is our hope that someone will recognize this individual and come forward. We were able to recover a very clear image of John Doe 28.”

John Doe 28 is described as a Caucasian male in his 30s or 40s with wire-framed glasses and a receding hairline. The video also offers some other identifying details: it reportedly shows the individual and the victim inside a home with a picture hanging over a blue chair, which the FBI hopes someone who spots the image will be familiar with. In the video, the man can be seen sporting a t-shirt with a fish logo.

“We need to identify John Doe 28,” Jurden said, “so we can make sure no harm comes to that little boy.”

Anyone who may recognize the man is encouraged to call the FBI tip-line at 1-800-CALL-FBI.

[FBI Release]