School officials launched an investigation this week after a student drew a swastika on a piece of paper and handed it to a classmate at a Northern Virginia middle school.

The incident took place Tuesday at Thomas Jefferson Middle School in Arlington, according to a letter that Principal Keisha Boggan sent parents Wednesday. The hate symbol was later reported to Arlington County police, who also opened an investigation, according to department spokeswoman Kirby Clark.

“Intolerance is not acceptable,” Boggan wrote in the letter, noting that the school “met with the students involved as well as their families.”

Boggan did not say whether the student who drew the swastika will face disciplinary measures.

“The staff at [Thomas Jefferson] strives to create a welcoming environment,” Boggan wrote. “To that end, we are stressing that if our students, staff and families hear or see something . . . they say something immediately.”

The episode follows a string of swastika-related incidents in the Washington area. In March 2019, students at the elite Sidwell Friends School in the District projected swastikas onto screens during a presentation at an assembly.

In November, a swastika was scrawled on a student desk at Silver Creek Middle School in suburban Maryland, one of several swastika-related incidents that have taken place on Montgomery County campuses this school year.