The Sydney siege Besieging led to Causation a 16-hour standoff Hostile_encounter , after which a gunshot Use_firearm was heard Perception_active from inside and police officers from the Tactical Operations Unit stormed Attack the café .

The operation was also significant as it was the first deployment Arranging of 1 ATF outside its Tactical Area of Responsibility ( TAOR ) in Phuoc Tuy , and in this it set Placing a precedent for later operations outside the province .