The teacher, who has not been arrested and whose name has not been released, was removed from classes at the North Hills school over allegations of "inappropriate behavior" involving an 11-year-old girl student, according to the Los Angeles Police Department and Los Angeles Unified School District.
In a letter dated Thursday and sent to parents and guardians of students at the school, Principal Dana Carter wrote that "an allegation has been made of inappropriate behavior involving a staff member. Upon receiving the information, the proper authorities were notified.
"Our school and the Los Angeles Unified School District take allegations very seriously and fully cooperate with the investigative agencies," Carter wrote. "I want to reassure parents and guardians that the school and district take every precaution to ensure the safety of students and staff at our school.
"As the principal of Lassen Elementary School, the safety and well being of our students and staff are my top priorities," the letter states.
Anyone with information on this case was asked to call the LAPD's Mission Area detectives at 818-838-9810 or the department's 24-hour tipline at 1-877-LAPD-24-7. All tips can be made anonymously.