Sparrowhawk Attack?

Went for a walk round the Reading University lakes with Zoe this evening.  Just as we were walking past Foxhill House there was a frantic fluttering in the bushes at ground level and then a dark grey bird flew up and away.   On the ground there was a circular patch of  grey feathers and a pigeon limping off to hide in the bushes.  I reckon that we had disturbed a sparrowhawk in the process of trying to kill the pigeon.