A custodian at Assabet Valley Vocational Technical High School in Marlboro has been charged with possessing child sex abuse materials, according to Massachusetts State Police.

State Police said they received a tip from the National Center for Missing and Exploited Children that led them to the Westborough man, 25, who was recently hired at the high school.

In Court documents, troopers said the man admitted to using the anonymous and encrypted Telegram app on his phone to view and sometimes download child sex abuse material from the internet. Those documents also say the man was hired at Assabet Valley Vocational Technical High School last month, and previously worked for Westborough Public Schools for the last four years.

Police informed administrators of both schools of the arrest beca

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