President Obama opens African-American Smithsonian Museum

President Obama has opened the Smithsonian Institution's first national museum about African-American history in Washington DC.

In a speech, he drew on key figures and moments in history, from slavery through to present day protests over police shootings of African-American men.

The president then rang a bell belonging to one of America's oldest black churches - "an echo of the ringing of bells that signalled emancipation, more than a century and a half ago".