The president of a school district board in California has been arrested after thousands of child pornographic videos and images were found in his home, police said.

Dennis Brian Chambers, 50, was arrested on charges of suspicion of distributing and possessing child pornography following a six-month investigation by the Fontana Police Department and other agencies tracking a group of individuals who were allegedly distributing child porn over the internet, the department announced Thursday.

A search warrant was executed Wednesday at Chambers’ home in Buena Park, where investigators found an electronic storage device containing thousands of pornographic images and videos involving children. Chambers was arrested at his home and later booked at the Santa Ana Central Jail, police said.

It’s not immediately clear whether any of the children in the images and videos were students in the Buena Park School District, where Chambers has served as school board president. His four-year term was set to expire next year, KTLA reports.

Fontana police Detective Jeremy Hale told the station that the “huge” case involves many people. Investigators were able to capture several videos and images from members of the group and eventually tracked an IP address to Chambers’ home.

Greg Magnuson, superintendent of the Buena Park School District, said the arrest “shocked and disappointed” administrators and faculty members.

“His egregious personal behavior has nothing to do with his role as a board member, or our schools,” Magnuson said in a statement. “I want to assure you that the safety and well-being of our students remain our number one priority.”

Magnuson said district officials were not contacted by authorities regarding Chambers’ alleged conduct or his contact with students or staff during the investigation.

Chambers remains jailed on $250,000 bail, according to records cited by the Los Angeles Times. He’s scheduled to be arraigned Friday.

When Chambers was elected to the Buena Park school board in 2010, he had already worked with the district for about eight years, according to the Orange County Register. He told the newspaper he had fiscal issues and the district’s students on his mind at the time.

“My No. 1 goal is to secure funding,” Chambers said. “Budget issues must take priority.”

He added: “Before every decision is made, I ask how it benefits the kids.”