US President Barack Obama has marked the 50th anniversary of the Selma civil rights march in Alabama by paying tribute to the “heroes” who took part.
He delivered a speech commemorating “Bloody Sunday” on 7 March 1965, when security forces attacked black demonstrators in the city.
Mr Obama said the marchers, who were campaigning for equal voting rights, had “given courage to millions”.
His wife Michelle and about 100 members of Congress also attended the event.
“Because of what they did, the doors of opportunity swung open not just for African-Americans, but for every American,” he said, standing in front of the Edmund Pettus Bridge where the violence took place.
A crowd of some 40,000 people watched as Mr Obama and his family led a symbolic walk across part of the bridge, accompanied by those who had made the march in 1965.