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?"
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Around 31 people are still thought to be missing after the boat sank on a reservoir near the city of Medellin.
Bins were set on fire and objects were thrown at officers as protesters demanded justice for the death of Edir Frederico Da Costa.