A former Los Angeles elementary school  teacher who taught for more than 35 years has been arrested on accusations he  sexually abused 20 students.

Police say Robert Pimentel has been charged  with 15 felonies, and he is expected to be charged with misdemeanors for the  remaining incidents at George De La Torre Jr. Elementary in the Wilmington area  of Los Angeles.

Pimentel's bail has been set at $12 million,  and an arraignment date hasn't been set.

Police and school officials also said  Pimentel is also suspected of the sexual abuse of one adult, but did not say  what role if any that person had at the school.

Pimentel, 57, left his fourth-grade teaching  position last March when allegations arose from several girls who told their  parents he inappropriately touched them during school and police opened an  investigation.

District officials immediately removed him  from campus and parents and state credentialing authorities were informed,  school district spokesman Daryl Strickland said.

Parents and guardians will be told of the  arrest by letter and phone, he said.

'Due to the number of victims  involved in  this case, that's what took so long for it to culminate,'  said Det. Gus  Villanueva with the LAPD told ABC7.

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