New South Wales police officers wear protective masks as they place marker cones over potential evidence in their investigation into the Sydney cafe siege, December 16, 2014. Heavily armed Australian police stormed Lindt cafe in central Sydney on Tuesday and freed a number of hostages being held there at gunpoint, in a dramatic end to a 16-hour siege in which three people were killed and four wounded. REUTERS/Jason Reed (AUSTRALIA - Tags: CRIME LAW CIVIL UNREST)