Relatives of victims of gun violence and gun violence prevention advocates hold up photos of victims during a press conference to honor the second anniversary of the shootings at Sandy Hook Elementary School in Newtown, Connecticut, at the US Capitol, Washington, DC, December 10, 2014. Advocates urged Congress to expand background checks in an effort to curb gun violence in the US. AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP via Getty Images)
