US celebrities have called for an end to gun violence following the Sandy Hook school shooting in Connecticut.
Jennifer Aniston, Beyonce Knowles, Ellen De Generes and Will Ferrell are among the well-known faces to join the Demand a Plan campaign.
In the black and white video, they ask: "How many more? How many more colleges? How many more classrooms? How many more movie theaters? How many more houses of faith?"
More top news
Prince William and Kate have announced they are to become 'full-time' Royals as they move their family back to London from Norfolk.
Jobs for Americans, a strengthened military, new trade deals and support for police will shape Donald Trump's four years in government.
Donald Trump pledged to put "America first" as he addressed the nation after being sworn in as the 45th president of the United States.