"The details of the situation are still unfolding, but whatever they are, this is very traumatic for our students, staff, families and community," Eric Dill, superintendent of the San Dieguito Union High School District, said in a letter posted on the school's website. "As a community, we have a shared responsibility to care for one another. Please rest assured that we will do everything possible to maintain our daily routine while supporting each other as we deal with this sad event."