Images of the two victims who died in the Sydney cafe siege, lawyer Katrina Dawson (R) and Lindt store manager Tori Johnson are pictured among floral tributes at a makeshift memorial before sunrise in Martin Place, December 18, 2014. Australian Prime Minister Tony Abbott on Wednesday ordered a sweeping investigation into a deadly hostage siege after tough new security laws and the courts failed to stop a convicted felon from walking into a Sydney cafe with a concealed shotgun. REUTERS/Jason Reed (AUSTRALIA - Tags: CRIME LAW TPX IMAGES OF THE DAY)