Pope installs new cardinals, including first African American

• Wilton Gregory, 72, joins College of Cardinals in Vatican
• Pope Francis further shapes electorate for his successor

Pope Francis has installed 13 new cardinals, including the first African American to hold the high rank, further expanding the pontiff's impact on the group that will one day elect his successor.

Wilton Gregory, the 72-year-old archbishop of Washington DC becomes the first African American cardinal at a time the United States is examining race relations after a spate of police killings of unarmed black people.