Uh oh, you're in trouble with mom. 

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Uh oh, you're in trouble with mom.![]()
Is it just the coop or did they get in a run to get to the coop?
Is that a gap that I am seeing there in your picture in the upper right side corner? There seem's to be a lot of light coming in there? Is that were your predator got in at?
Why do your chickens roost outside? Do you have to physically put them inside and that's why you let them sleep outside that night?
What do you have for predator protection? How are you set up? Run? Apron? Aerial cover?
My guess would be raccoon.