Customers dine at the Lindt cafe on Sydney's George Street, December 18, 2014, which opened its doors for the first time on Thursday following a siege at Lindt's nearby Martin Place outlet. The Lindt cafe at Martin Place remains closed during police forensic investigations. Australian Prime Minister Tony Abbott on Wednesday ordered a sweeping investigation into the deadly hostage siege after tough new security laws and the courts failed to stop a convicted felon from walking into the Sydney cafe with a concealed shotgun. REUTERS/Jason Reed (AUSTRALIA - Tags: SOCIETY)