Immigration raids have affected student well-being, enrollment, and attendance, while bullying has increased, according to high school principals across the country for a study published by UCLA and UC Riverside.

The research found that among a variety of challenges principals said impacting their schools, the impact of immigration enforcement was the issue that garnered the most attention.

Of the more than 600 high school principals surveyed for the study, nearly 40% said students from immigrant families have been victims of bullying.