Barack and Michelle Obama have sent their best wishes to Nelson Mandela on the former South African president's 95th birthday.
The US president and first lady said the world can honour Mandela by heeding his example and serving others.
The couple met the Mandela family last month on a visit to the former prison on Robben Island where the former leader spent 18 years in jail.
More top news
A man has 'potentially life-changing injuries' after acid was thrown over him after a screening of the movie Straight Outta Compton.
A leading sexual health clinic has apologised after mistakenly sharing the HIV positive status of hundreds of patients in an email.
Skeletons unearthed in a mass grave in Durham are the remains of Scottish prisoners of war, experts have found.