SONOMA, Calif. - A third person has been arrested in connection with a home invasion robbery in Sonoma, authorities said.

Detectives say former house cleaner was involved

What we know:

Investigators suspect that a former housekeeper at the home that was ransacked last month was in on the robbery.

On Sept. 12 at about 4:15 a.m., Sonoma County deputies responded to the 3000 block of Wood Valley Road after reports of an armed robbery involving masked suspects.

Authorities said the suspects were armed with guns and forced themselves into the home and restrained three people, two of whom were elderly. The suspects threatened the victims and demanded valuables. One suspect struck a resident over the head with a blunt object before fleeing with stolen items.

Two suspects arrested at cas

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