Something killed a couple chicks :(

I went into the coop this afternoon to gather eggs and found two of the mama hen's chicks dead in the coop. It looked like something had bit their necks. This was one of the gold ones, and Speckles :( The blue chick was nowhere to be found, so I guess whatever killed them carried him away. There are just two nervous gold chicks remaining. This is the worst luck ever. I started with eight, and I'm down to two! First time we've had any predation in the coop too. I've lost a few hens to the local hawks, but this was clearly something that went into the coop and attacked them while they were sleeping.

_