WASHINGTON -

The Federal Bureau of Investigation is looking for tips about a man who it says was caught on video engaging in sexually explicit activities with a young boy.

The FBI has dubbed the man John Doe 28 and says the video was found in November 2012 by the National Center for Missing and Exploited Children.

The FBI says the video contains a brief image of John Doe 28 and that it hopes images of him captured from that video will lead to a break in the case. “Subjects who show their faces in child pornography are not typical,” said Special Agent Karen Jurden. “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.”

In addition to a clear image of the man's face, investigators were also able to capture other images that might provide clues about his identity. The images show the man and the victim inside a home with what appears to be a blue chair and a picture hanging on a wall in the background. Also, John Doe 28 is wearing wire-framed glasses and a burgundy T-shirt with a fish logo on it.

The FBI says it has no idea where the video originated but that the man speaks English, which leads them to believe he could be an American citizen. “Sometimes we will get some type of identifier that narrows down the geographic region,” said Jurden, who has been investigating crimes against children for the last four years, “but that didn’t happen in this case. That’s why we are asking for the public’s help nationwide.”

The video is just over two minutes long and was recovered during the arrest of a San Francisco man on child pornography charges, according to the FBI. “The video was part of his collection,” Jurden added, explaining that sexually explicit videos and images of children are often traded anonymously through online forums.

John Doe 28 appears to be a Caucasian male in his 30s or 40s who has a receding hairline and wears wire-framed glasses. Anyone with information should submit a tip online or call the FBI’s toll-free tip line at 1-800-CALL-FBI.