Earlier this week, a Jehovah's Witness church in Rowland Heights on the 19000 block of Kilian Avenue was spray-painted with hate messages.
Similar graffiti was found on the Rolling Hills Seventh Day Adventist Church on the 28000 block of Highridge Road in Rolling Hills Estates.
Investigators have not released details of the graffiti found in the latest incident, but the sheriff has ordered more patrols near churches.
