Arrests in Florida double murder

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A total of six people have been arrested following the killing of a wealthy Florida couple in their home last week, police have said.

Melanie and Byrd Billings were shot dead while they slept in the home they shared with their 16 children.

They had four biological children and 12 adopted children.

The sheriff of Okaloosa County in north-west Florida said there had been two new arrests on Tuesday. Four suspects were arrested on Monday.

The couple, who lived near the city of Pensacola, were known for caring for children with special needs in their large, nine-bedroomed house.

US media report that all the children's rooms were equipped with cameras so the children could be monitored. A swimming pool next to the property was gated.

Two of the suspects were captured entering and leaving the property on one of its many CCTV cameras, according to the reports.

Nine of the Billings' children were reported to be at home at the time of the attack. None were harmed.