The Latest on the killing of eight members of a family in southern Ohio (all times local):

2:25 p.m.

The Ohio Attorney General's Office says the last autopsy of eight slain family members is being completed.

A spokeswoman for Attorney General Mike DeWine says the autopsy is being done Monday on the victim from Pike County in southern Ohio.

Authorities are scrambling to determine who killed the eight last week in slayings that have shaken residents of their rural southern Ohio community.

Investigators say they found marijuana operations at three of the crime scenes but didn't say if the deaths were linked to pot.

Marijuana seizures are common in Pike County, where authorities said a 2012 seizure could be connected to a Mexican drug cartel.

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1 a.m.

Authorities are scrambling to determine who killed eight family members in a "pre-planned execution" that has shaken residents of their rural southern Ohio community.

Attorney General Mike DeWine Sunday described the killings at four homes near the small community of Piketon Friday as "a sophisticated operation." Seven adults and one teenage boy were found shot in the head; three young children were not harmed.

Pike County Sheriff Charles Reader says it's clear the family was targeted, and he's told the victims' relatives to arm themselves.

Authorities have refused to discuss many details of the crime, a potential motive, weapons, or the search for the assailant or assailants. They say they found marijuana operations at three of the crime scenes, but didn't say if the deaths were linked to pot.