Muslims around the world today marked Ashoura, a holiday celebrated mostly by Shiites, as it marks the death of Imam Hussein, whom Shiites believe was the rightful successor to the prophet Mohamed. Hussein is buried in Karbala, a southern Iraqi town where millions gathered today, despite the threat of attacks and continued warfare around the country. Violence in the country today, however, still left at least seventy dead. David Enders and Hiba Dawood report.