The ex-wife of multi-billionaire energy tycoon Harold Hamm plans to appeal a court ruling that awarded her nearly $1bn (€790,000m) in a divorce settlement, according to her attorney.

US Congresswoman Gabrielle Giffords has returned home to her astronaut husband, leaving behind a Houston hospital where she began to rebuild her life after a gunman shot her in the head five months ago.

Jackson Browne, Alice Cooper, David Crosby and Graham Nash are to perform in a concert in Tucson, Arizona, to raise funds for a charitable fund established after the shooting there which killed six people and wounded 13 others.