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Remembrance services are being held in the United States to mark the eighth anniversary of the hijacked plane attacks of 11 September 2001.

Nearly 3,000 people died when the four planes crashed in New York, at the Pentagon and in a Pennsylvania field.

Thousands of people gathered in a square near the Ground Zero site in New York, where the twin towers of the World Trade Center were destroyed.

President Barack Obama will speak at the Pentagon site.

Americans have been encouraged to contribute to a national day of service.

US soldiers in Afghanistan completed a 9.11km (5.5 mile) run to mark the day.

‘Sacrifices of thousands’

Moments of silence are being observed at the sites.

President Obama will join defence secretary Robert Gates at the Pentagon, where 184 people died, to meet members of victims’ families and lay a wreath.