Ohio Authorities Scramble for Clues in Family Murder Manhunt

Investigators now say three of the four homes had commercial marijuana grow operations.
1:40 | 04/25/16

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Transcript for Ohio Authorities Scramble for Clues in Family Murder Manhunt
In Ohio tonight, an urgent man hunt is now widenening after eight members of the same family for willed. Authorities saying it was automobile well played. Investigators the telling other family members now to arm themselves. And officials just confirming a Facebook threat that might have been made against one of the victims beforehand, the youngest victim, just 16 years old. ABC's Alex Perez on the scene. Reporter: Tonight, the manhunt in Ohio is growing. Investigators trying to zero in on the killer. I just found my cousin with a gunshot wound. Okay. Sir, was he alive? No, no. Reporter: The first chilling 911 calls detailing the execution style murders. All eight victims members of the same family. The youngest -- just 16 -- high school freshman Christopher Rhoden. Tonight, word inveps gatders are following up on a possible threat that may have been posted on his Facebook page. Hanna Rhoden was in bed with her 4-day-old daughter when she was killed. Thncht was not a spur of the moment murder. Reporter: No sign of the killer or killers in this rural community. The nightmare spread across four homes. Investigators now saying three of them had commercial marijuana grow operations. With this town on edge, the sheriff even giving the family members an alarming warning. I advise them as their sheriff to be armed and to use caution, because they were a target, it's evident. Reporter: And David authorities say there are now 200 investigators working 24/7 to track down whoever murdered this family. David?

This transcript has been automatically generated and may not be 100% accurate.

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