How does corpo PR still mess this sort of thing up so badly? Just issue a statement:

1. Acknowledge and take responsibility for your part of the incident. DO NOT try and shirk any responsibility.

2. Outline what you will do to prevent the problem for happening again.

3. Commit to providing progress updates on the resolution.

On issues of this magnitude, there’s simply no way to compensate everyone whose time and effort you’ve wasted. Don’t insult people with a meagre offering. Instead, commit those resources to a resolution, and simply ask for forgiveness.