It has been reported that a number of dry cat foods have been recalled due to a increasing number of cases of Pancytopenia. A serious illness which can be fatal if not treated urgently.
Here is the official recall link
If you currently feed your cat any of the listed products and have noticed them becoming unwell contact your vet urgently. If you have any concerns call your vet for advice.
You can return any of the listed products to the place of purchase for a full refund.