A swastika-like symbol found outside a Stanford University residence hall earlier this month could be linked to others found on campus late last year, according to the Department of Public Safety.
The graffiti was found outside Lantana Hall within the Gerhard Casper Quad at 661 Escondido Road, public safety officials said.
The vandalism happened sometime during the first five days of the month, which adds "another degree of difficulty to our investigation," public safety Lt. Jon Hernandez said in a press release.
On Wednesday, the residence hall's housing manager reported the symbol to public safety officers, who took pictures of the marking that same day, department officials said.
"At present, we have no witnesses, no video surveillance and no leads," Hernandez said.
The symbol was drawn with a "tar-like or grease-like substance," and no evidence was left behind, he said.
Investigators suspect the same person who drew the symbol earlier this month is linked to 23 other poorly drawn swastikas that appeared on a pillar at the Main Quad, clock tower and other campus areas since late December, department officials said. Other swastika-like symbols were found at nine locations in Palo Alto starting late last year, police said.
No one has been charged for the earlier instances of vandalism at Stanford, according to public safety.
The department will interview the campus community to determine when the vandalism occurred.
In response to the latest incident, Rabbi Jessica Kirschner, executive director of the university's Hillel@Stanford, wrote a letter to the Jewish center's community and supporters.
"While the police do their work to apprehend the perpetrator, we at Hillel are all the more committed to our work in the face of incidents like these," she said.
"In light of incidents like these directed toward Jews and other people, we are bringing renewed energy to building relationships across campus with groups who may share our feelings of vulnerability, and we are committed to a vision of a university community where all members feel secure and at home," Kirschner said.
Anyone with information that can assist in the investigation is asked to call the department's 24-hour hotline at 650-329-2413.