Robert Pimentel, 57, who taught at George de la Torre Jr. Elementary School in Wilmington, was taken into custody by Los Angeles Policy Department detectives, who had launched an investigation in March after several fourth-grade girls said they had been inappropriately touched. Prosecutors filed 15 charges against Pimentel involving a dozen of his alleged victims. The charges involve sexual abuse and lewd acts on a child and cover the period from September 2011 to March 2012, according to court records. Authorities said the teacher is suspected of inappropriately touching children under and over their clothing.