PALO ATLO >> Palo Alto police are investigating a vandalism case in which “KKK” was written in two bathrooms at a middle school, according to authorities.

Police responded to a report of vandalism from administrative staff Wednesday about 4:06 p.m. at a middle school, authorities said. Someone wrote “KKK” in two restrooms at Fletcher Middle School at 655 Arastradero Road. Staff members already removed the graffiti before the police arrived.

The vandalism occurred Tuesday and Wednesdayin two separate boys’ restrooms on campus, and in both instances, the person wrote “KKK” using a marker or a pen, police said. It was written on a bathroom stall Tuesdayand was written on the walls and a toilet paper dispenser Wednesday. Police said they think the same person committed the crimes. Officers are investigating the incident and are working with school administration.

Police previously investigated a graffiti vandalism in Januaryat a Palo Alto elementary school, according to authorities. Police said someone wrote a racial epithet directed at Black people on school property. School officials also found a sign that displayed two non-White children that also had been crossed out and removed it. The case is still ongoing, and no suspects or arrests have been identified or made. Police don’t have evidence to connect the two cases at the two schools.

Anyone with information about the case has been asked to call the police’s 24-hour dispatch center at 650-329-2413. Anonymous tips can be emailed to paloalto@tipnow.org or sent via text message or voicemail to 650-383-8984.