Detailed Instructions: You will be given a context and a verb separated with a newline character, and you have to answer if the given verb is a negation or not. A verb is a negation if it is not going to exist, not happen, or has no effect. The output should be "Yes" if the verb is a negation and "No" otherwise.
Q: They were too afraid to stay, fearing the forces may also move their operations further afield. By mid afternoon, official Serb sources were saying the operation was over, but that has not yet been (confirmed) from Belgrade, the capital of Serbia, which is where the whole attack is thought to have been planned.
Verb: confirmed
A:
Yes