Awww, I am so very sorry for your loss. I can't say for sure what got them, but know they can leave large numbers of feathers behind just struggling. There's a slim chance that some of them could find their way back home, I hope so if it's at all possible.
Get yourself one or more live traps, like the Hav-a-Hart traps sold at Home Depot. There are other threads here about what to use for bait, and what to do with the animals you trap. Have your plan in place before you trap a predator, and pleasepleaseplease do NOT plan to release it far away from your place. One man's wilderness may be the edge of another man's property.
Perhaps you could speak with your neighbors about leaving cat & dog food out & available, especially after dark. And also about keeping their garbage cans covered & secured. Animals like raccoons, opossums, & skunks have actually had their populations increase due to development in formerly wild areas. Their predators have been eliminated, but their food sources have expanded with all the pet food & garbage cans, and they're not shy about living near human habitation.