CBS affiliates are agonising about hard-hitting Robert De Niro-hosted documentary 9/11, after CBS was slammed with a $550,000 (€427,800) fine in July over Janet Jackson's 2004 Super Bowl 'wardrobe malfunction'.

Following Janet Jackson’s surprise breast-baring on the American football Super Bowl halftime show, CBS television said it would institute a video delay system to avoid any recurrence at Sunday’s Grammy Awards.