Petrobras files writ of mandamus against an injunction suspending Transocean's activities in waters offshore Brazil. (Mandamus is an extraordinary writ commanding an official to perform a ministerial act that the law recognizes as an absolute duty and not a matter for the official's discretion. (Source: Advanced English Dictionary). Petrobras filed a writ of mandamus, in the capacity of injured third party, to suspend the injunction granted on July 31, 2012 that ordered the shutdown of the activities of Transocean Brasil Ltda (Transocean). The injunction stems from the Public-Interest Civil Action filed by the Federal Prosecution Office in the Federal Courts of the state of Rio de Janeiro against Chevron Brasil Upstream Frade Ltda (Chevron)…