They said the girl's parents both told detectives that their daughter had a history of mental health

They said the girl's parents both told detectives that their daughter had a history of mental health issues, had been seen by a psychiatrist, and had recently been asking about where the guns were kept in the house.
"We were very fortunate on this occasion to prevent another possible mass tragedy," Arpaio said in a statement. "It takes more than just law enforcement though. We need the active co-operation of parents, members of the community, and friends and neighbours to effectively stop these potential disasters before they happen."
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