DeKalb school officials continue seeking to determine who scrawled threats in a Dunwoody High School bathroom a week ago.

The vandalism was reported Nov. 10. The writing suggested minorities had been targeted in an attack expected to take place Friday. No incidents were reported Friday.

An investigation by the district’s police found nothing credible in the threats. Still, additional officers were assigned to the school as a precaution.

A note was sent home to parents informing them of the graffiti.