A massive 7.0-magnitude earthquake has struck the Caribbean nation of Haiti. The extent of the devastation is still unclear but there are fears thousands of people may have died.

Haiti's worst quake in two centuries hit south of the capital Port-au-Prince on Tuesday, wrecking the presidential palace, UN HQ and other buildings. A "large number" of UN personnel were reported missing by the organisation. Many people have spent the night outside amid fears of more aftershocks.

The Red Cross says up to three million people have been affected.