[cnn-photo-caption image="http://i2.cdn.turner.com/cnn/2009/CRIME/07/16/florida.couple.killed/art.billings.entrance.cnn.jpg" caption="Friends left notes of mourning at the entrance of the Billings' home Thursday in Beulah, Florida."]
Authorities have located valuable evidence, including a stolen safe and several guns, in the slaying of a Florida couple who had adopted 13 children, a state attorney said Thursday.
1 of 2 Bill Eddins said the safe had been taken from the couple's home. He said authorities found several guns, including one they believe was used to kill Byrd and Melanie Billings.
The two were shot to death July 9 in their Beulah, Florida, home with nine of their children present.
"In our opinion this was a home invasion-robbery where the people stole a safe and we recovered the safe," Eddins told reporters at a news conference. "I personally ... think it is as simple as that in terms of the motive."
Sheriff David Morgan of Escambia County, Florida, said authorities do not believe that anything else is missing from the Billingses' home.
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