Search and Delete Messages

Good afternoon.  We recently had a virus-laden e-mail hit our company and users had clicked on links that had downloaded some Trojan viruses.  We have this cleaned up, but it got brought up to delete any of these messages from Enterprise Vault.  I just used Discovery Accelerator to find all of the messages, but not sure if I can delete from the archive from there.  I know I can set EV policy to allow deletion, but is that just by user?  Is there a way to globally search every archive for certain messages and then purge them?

Thanks!