NSW Premier Gladys Berejiklian has vowed to stop Sydney music festival Defqon.1 after two young people died and another two were left fighting for their lives after multiple suspected overdoses.
Around 700 people were treated, including 18 who were hospitalised, during the event at Castlereagh in southwestern Sydney on Saturday.
"I'm absolutely aghast at what's occurred. I don't want any family to go through the tragedy that some families are waking up to this morning," she said.
