US President Barack Obama (R) shakes hands with Police Commander Cheryl Moody from Pasadena, California at the "Advancing 21st Century Policing" briefing at the White House in Washington,DC on July 22, 2016. President Obama on Friday pledged support to Germany in the wake of a deadly shooting rampage in Munich, as officials said they were working to determine if any US citizens were affected. / AFP PHOTO / YURI GRIPASYURI GRIPAS/AFP/Getty Images