San Jose police arrested Israel Santiago on Monday after being called to Adelante Dual Language Academy.
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Detectives interviewed several students, and at least 10 disclosed inappropriate touching by the suspect.
All the alleged assaults occurred in the school's music and band room.
The Alum Rock Union Elementary School District released a statement in wake of Santiago's arrest saying he hasn't been on district property since Nov. 1.
District officials say they are fully cooperating with San Jose police's investigation and say every employee goes through a thorough background check prior to employment, including fingerprinting.
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