For the fourth time in about a month, Santa Barbara fire investigators are trying to find out who started a fire near the buildings at McKinley Elementary school on Cliff Drive and Loma Alta on the mesa.
Friday night another small fire broke out in the dry grass on the campus.
Three other fires were stopped in May. All were in the evening or at night. No structures have been involved.
Neighbors have been questioned and patrols have been stepped up in the area.
Fire officials say they are most likely all related.