RICHMOND (CBS SF/BCN) — Students getting in-person instruction at a Richmond elementary school have returned to distance learning for the rest of the week after van with a disturbing message was found parked across the street, according to West Contra Costa Unified School District officials.

An abandoned and graffiti-covered van with “School Shooting May 26” spray-painted on the side was spotted Friday across the street from King Elementary School on Florida Avenue.

READ MORE: 23rd Annual 'A Home For The Holidays At The Grove' Comes To CBS On Sunday, December 5th

Superintendent Matthew Duffy said in a letter to parents that school principal Joey Sundberg immediately contacted Richmond police and district administrators.

READ MORE: Yuba County Agency Mulls Water Shipments to Bay Area Counties

“We are working with the Richmond police, who are actively investigating the incident,” Duffy wrote. “The safety and well-being of students, families, and staff are our top priority. In an abundance of caution, we have closed King for in-person instruction for the rest of the week.”

Sundberg and other school administrators worked to notify the school community in the days following the discovery.

MORE NEWS: 'Let it Glow' SF Lights Up San Francisco To Revive Pandemic-Stricken Downtown

Anyone with information about the case is asked to contact the Richmond Police Department at (510) 233-1214.