Question: What year was the prison holding one of the two arrestees in the 18 September 2014 counter-terrorism raid opened?
Sentence (from "2014 Australian counter-terrorism raids"): On the morning of 18 September 2014, police in Australia carried out the biggest counter-terrorism operation in the nation's history, with over 800 heavily armed officers targeting households in the cities of Sydney and Brisbane.
Relevant evidence: No