SAN FRANCISCO (CBS SF) — Federal authorities in San Francisco on Wednesday announced that child daycare center worker in the city has been charged with possession of child pornography that appears to have been made at his place of employment.

The announcement was made by Acting United States Attorney Stephanie M. Hinds and Federal Bureau of Investigation Special Agent in Charge Craig D. Fair.

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According to the federal complaint filed Wednesday, 26-year-old San Francisco resident Jace Wong used the social media application Kik to join an online chat group that shared child sexual abuse material.

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The affidavit said that Wong posted three videos and two still photos last Friday. In each, a girl between the age of 4 and 6 was seen in a bathroom partially disrobed. In each picture, black and white floor tiles and beige toilet dividers were visible.

On Sunday and Tuesday, an undercover officer engaged Wong in chat on Kik about the images. Wong asked if the officer was interested in trading “content.”

During the online chat, Wong sent the officer a 36 second video in which a prepubescent female, estimated to be 4 to 6 years old, is seen standing on a black and white tiled bathroom floor with her pants down to her ankles and her private parts exposed.

According to the release, law enforcement was able to identify Wong and his location at the time, which was the San Francisco daycare center where he was employed. Wong was arrested Tuesday afternoon as he left the daycare center.

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Following the arrest, agents observed a black and white tiled bathroom in the facility believed to be where the video was filmed.

Wong was interviewed by authorities on Tuesday evening. According to the affidavit, at that time Wong admitted that he had sent and received sexually explicit photos of minors on Kik, including at least three videos taken at the daycare facility.

During the interview, Wong allegedly showed agents a hidden file on his phone with 428 media files, “many of which contained videos and images of minors engaged in sexually explicit conduct.”

Agents also found an 8-minute-long video depicting sexual activity between a man and an underage girl.

Wong has previously worked in other daycare facilities, including one in in Livermore. According to the affidavit, agents are working to identify those facilities.

Authorities said Wong is scheduled to make his first court appearance on the complaint Thursday morning at 10:30 a.m. in San Francisco before United States Magistrate Judge the Honorable Jacqueline Scott Corley. Wong currently remains in custody.

Wong is charged with possession of child pornography. If convicted, he faces a maximum sentence of 20 years in prison and a fine of $250,000.

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FBI investigators working on the case are asking anyone who might have additional information about Wong or his activities that are relevant to the case to email the FBI tip line at tips.fbi.gov or call (415) 553-7400.