Attack in the dark.

So...just as we were going to bed we heard a commotion next door from our neighbour's chooks. We texted them but got no reply and when we heard further commotion we went to investigate. The chook pen door was open, there was one hen on a perch, a dead rooster on the floor and another dying hen lying next to it. There was another hen alive but laying low in the outside pen. We rang the neighbours who were in bed and told them the news, shut the door and came home leaving them to sort it.On the way back to bed we went and checked our own chooks. Scarily the rock and log that hold down the netting at the door had been scraped away. I remember closing it firmly at sunset. Luckily all our birds were safe. We think the fox might have got in but was distracted by the food scraps we had thrown in the pen.We have placed a heavier rock at the door to hold the netting down.