SYDNEY, AUSTRALIA - DECEMBER 15:  Members of the public look on during the one year service of the Lindt Cafe Siege on December 15, 2015 in Sydney, Australia. Today marks the first anniversary of the deaths Katrina Dawson and Tori Johnson, who were killed along with the gunman following a 17-hour siege at the cafe in 2014.  (Photo by Ryan Pierse/Getty Images)