Children look at posters calling for an end to police violence near fans going to a "Rally 4 Peace" concert by Prince in Baltimore, Maryland on May 10, 2015. Musical artist Prince is holding the concert in Baltimore on Mother's Day after the death in police custody of an African American man sparked sometimes violent protests. AFP PHOTO/ ANDREW CABALLERO-REYNOLDS (Photo credit should read Andrew Caballero-Reynolds/AFP/Getty Images)
