President Bush signed a waiver exempting 22 countries because they had signed but not yet ratified immunity agreements .
President Bush signed a waiver exempting 22 nations from these sanctions because they had signed but not yet ratified the immunity agreement .
They have been identified by the Tarrant County Medical Examiner 's Office as Melena 's brother , Angel Melena , 25 , and Narcisco Del Angel Lozano , 34 .