Authorities are investigating an attack on an autistic Jewish teen in a Nevada school after his family discovered a swastika carved onto his back.

The 17-year-old boy is nonverbal, has a support dog and needs assistance when he goes to class at Clark High School in Las Vegas, his mother told Jewish news outlet COLlive.com last week.

The boy’s mother, who asked COLlive not to identify her, has since pulled him from the school because she thinks it is an “unsafe environment.”

“My son is the only student I know of who wears a Kippah at the school,” she told the outlet, referring to the cap worn by Jewish men and boys.

The mother noticed the swastika cut into her son’s skin on March 9. She also said she noticed the equipment bag attached to the son’s service dog had been tampered with.

She told COLlive that she emailed the school that night, but her son’s in-school assistant told the mother that nothing happened at the school. The school doesn’t have cameras in the classrooms, locker rooms or bathrooms.

The mother filed a report with the Clark County School District on March 13, but the attack only became widely reported last week.

School officials told NBC News in a statement that they found no evidence in their investigation of who attacked the student.

“We will not tolerate discriminatory behaviors that contradict an inclusive community and impact student safety and well-being,” the statement said. “If anyone has any additional information related to this case, we urge them to contact school police immediately.”

The FBI said it’s in touch with Nevada police about the ongoing investigation.

“We are aware of the incident and are in regular contact with local authorities. If during the local investigation, information comes to light of a potential federal civil rights violation, the FBI is prepared to investigate,” the agency said in a statement to NBC News.

• Matt Delaney can be reached at mdelaney@washingtontimes.com.