Do you know this man? FBI appeals to the public to help find pedophile 'John Doe 28' caught on video abusing young boy

FBI and National Center for Missing & Exploited Children (NCMEC) release screen grabs from video recovered from a known pedophile's home in San Franciso

The footage shows an unidentified man - labeled John Doe 28 - sexually abusing a boy for two minutes

The number 28 does not refer to his age



Authorities do not know where, when, or who is in the footage



Believe him to be American because he says one word, 'careful' during the video



The FBI has appealed for the public's help in tracking down a dangerous child predator caught on video sexually abusing a young boy.



The man, known only as John Doe 28, was discovered in a downloaded video in November 2012 by the National Center for Missing & Exploited Children (NCMEC).



The two agencies are so desperate to locate the man and rescue the exploited child that they have released three images of the pedophile to the general public in the hope of generating leads.



Scroll down for video

Identification: The FBI want to find this man who has been captured abusing a young boy (barely visible in the blue) on a video found in another pedophiles home - appealing to the public for their help

'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.'



Identifying marks: The FBI have asked if people can place this burgundy t-shirt with a fish logo on it

The NCMEC and the FBI's Violent Crimes Against Children program have enhanced screen grabs from the sickening film to help provide any clues that may lead to his identification.



Authorities hope details such as the picture hanging on the wall behind the man along with the blue chair in the images may jog someones memory.



Also, John Doe 28 wears wire-framed glasses and a burgundy t-shirt with a fish on it that a member of the public might recognize.

They have urges anyone who has any information to immediately contact the FBI.

Unfortunately, so far, the FBI and NCMEC have not been able to identify the man, or even the state, town or area - but they believe he is American, because he speaks one word during the video, 'careful'.



'Sometimes we will get some type of identifier that narrows down the geographic region,' said Jurden, who has been working on these types of cases for four years, 'but that didn’t happen in this case. That’s why we are asking for the public’s help nationwide.'



The two minute video was found during the arrest of a San Francisco man on child pornography charges.



'The video was part of his collection,' Jurden added, explaining that sexually explicit videos and images of children are often traded anonymously online.

The rush to find this man ar part of the FBI’s Operation Rescue Me and Endangered Child Alert Program (ECAP) initiatives and represent a longstanding partnership with NCMEC.

Since the inception of ECAP in 2004, 28 John Does have been investigated; 20 of these cases have been successfully resolved so far.

