Agreed. How about:

"We fcked up. Sorry. We really did. We're looking to identify the source of the decision. We'll be placing the person, or group of people, responsible on a performance plan (that will include the leadership team if appropriate). If they make continued similar mistakes, they'll be fired, or their compensation will be impacted. In the mean time, we'll be working hard to help the 17 poor souls who were sacrificed on the alter of this mistake".