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Authorities in Canadian County, Oklahoma, arrested a 15-year-old earlier this month in what they are calling “one of the worst” cases of child pornography they have encountered.

Authorities were alerted to a high volume of graphic pre-pubescent child pornography being distributed from a home in Mustang, Oklahoma, KTLA sister station KFOR reported, citing the Canadian County Sheriff’s Office.

Investigators showed up at the juvenile’s home on July 19 to execute a search warrant, the Sheriff’s Office said in a Facebook post.

“As our investigators were walking to the front door, the suspect actually opened it, peeked out. Apparently, by the look on his face he was a bit surprised, and slammed the door shut,” Chris West, Canadian County Undersheriff, said in the post.

Investigators pushed the door open and entered the home. When investigators determined no adults were home at the time, officers “secured the juvenile suspect until his guardians were contacted and returned to the residence.”

While waiting for the teen’s guardians to come home, investigators executed the search warrant. On the teen’s computer, officials said they uncovered “over 300 videos and images of pre-pubescent child pornography depicting children as young as 4 years old being raped and sexually exploited,” the Facebook post stated.

When the teen’s guardians arrived home, authorities interviewed the teen and he allegedly confessed.

“Because of the extreme nature of the child pornography that was being downloaded and distributed the juvenile was taken into custody, and multiple electronic devices were seized,” the Facebook post stated.

Investigators have found more than 1,000 videos and images of pre-pubescent child pornography on the electronics, which have been placed into evidence, according to the Sheriff’s Office.

“This case is absolutely one of the worst we’ve encountered involving a juvenile suspect and child pornography.  It’s hard to comprehend how anyone, and especially a kid this young gets involved so deep into the hideous world of child pornography,” West said.

The teen was arrested and taken to the Juvenile Detention Center. The case has been handed over to the Canadian County District Attorney’s Office.