BREWSTER — A 36-year-old Brewster elementary school teacher has been charged with sexually assaulting school children.Noah Campbell-Halley, of Harwich, faces six counts, including child rape, indecent assault and battery of a child under the age of 14, and intimidating a witness.He was being held Thursday on a $25,000 bond. It was not immediately clear if he had hired a lawyer.Police say they were contacted on Sunday by the parents of a Stony Brook Elementary School student.