Best Original Score: Characters from the animated feature film 'Up' are seen here. 'Up' took home the Academy Award for Best Original Score, by Michael Giacchino, at the Oscars on Sunday. Walt Disney Pictures/Reuters
Best Cinematography: Mauro Fiore accepts the Oscar for Best Cinematography for his work on the film 'Avatar.' Mark J. Terrill/AP
Best Costume Design: Sandy Powell (not shown) took home the Academy Award for Best Costume Design for her work in 'The Young Victoria,' seen here. Laim Daniel/Apparition Films/AP
Best Supporting Actress: Mo'Nique (r.) appears in a scene from 'Precious.' The actress was awarded the Oscar for Best Supporting Actress for her role in the film on Sunday. Lionsgate Pictures/Reuters
Best Supporting Actor: Actor Christoph Waltz accepts the Oscar for his role in 'Inglourious Basterds,' at the 82nd Academy Awards. Mark J. Terrill/AP
Best Original Screenplay: Mark Boal holds the Oscar for Best Original Screenplay for his work on 'The Hurt Locker.' Lucy Nicholson/Reuters
Best Actor: Jeff Bridges celebrates after winning Best Actor for his role in 'Crazy Heart' at the Oscars on Sunday. Gary Hershorn/Reuters
Best Actress: Sandra Bullock, shown here in 'The Blind Side,' was awarded the Oscar for Best Actress for her role in the film. Ralph Nelson/Warner Bros./AP
Best Director: Kathyrn Bigelow (c.) became the first woman to receive the Academy Award for Best Director for her work on 'The Hurt Locker.' Bigelow is seen here on the set of the film. Summit Entertainment/AP
Best Picture: From left: Screen Writer Mark Boal, Director Kathryn Bigelow, and Producer Greg Shapiro, pose backstage with their Oscars for Best Picture for 'The Hurt Locker.' Matt Sayles/AP
An outburst of violence in recent days between the Dinka and the Nuer in Sudan could portend civil war in the country, officials warned Wednesday. President Salva Kiir accuses rival Riek Macharf of sparking the violence, but says he is willing to begin a dialogue.
South Sudan's army said it had lost control of the flashpoint town of Bor on Wednesday, its first acknowledged reversal in three days of clashes between rival groups of soldiers that have triggered warnings of a slide into civil war.