To add insult to injury means to make a bad situation worse, but in this sentence the last twenty-four hours have actually improved the situation by not coming up with anything conclusive.
Consider the staetement "In order to make things a lot better, the last twenty-four hours have not come up with anything conclusive.". Based on this statement, is "To add insult to injury, the last twenty four hours have not come up with anything conclusive." a true statement? Yes/no/unknown