Police in California are searching for the person or persons responsible for fatally shooting seven people at an illegal marijuana-growing operation.

Riverside County sheriff’s deputies discovered a grisly scene upon arriving at a residence in the unincorporated area of Aguanga early Tuesday morning. After receiving a report about an assault with a deadly weapon at a residence, they discovered six bodies and one woman who had suffered gunshot wounds and later died at the hospital, according to the Associated Press.