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Hundreds of thousands of people around the world are taking part in March for Our Lives demonstrations, calling for an end to gun violence. The protests were sparked by a string of deadly school shootings, including the massacre in Parkland, Fla., last month. Organizers say they expected nearly a million people in Washington, D.C., alone, and celebrities such as Kim Kardashian, Kanye West, Paul McCartney, Arianna Grande and Cher were there. Click through for highlights.