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Police in Casa Grande say they don't a motive yet after four people have been found fatally shot inside a housing duplex near State Route 387 and McMurray Boulevard.

Officials say it's an isolated crime, the shooter knew the victims and it appears to stem from some kind of domestic issue.



Police and medical personnel discovered the victims "in a duplex type of residence" about 8:45 p.m. Thursday following a 911 call about gunfire.



The names of the four adult victims haven't been released and police say it's unclear if they are all related.



Police say two males are now in custody in connection with the shooting. Their names were not released.



They say weapons have been recovered, but it's still unclear if they were used in the killings.



Casa Grande is 41 miles south of Phoenix.

>>SkyFOX video from the scene: https://facebook.com/FOX10Phoenix/videos/1528581457190396

The Associated Press contributed to this report.