MELBOURNE: Andy Murray warned organizers were risking a tragedy on Tuesday as extreme temperatures caused players to faint and vomit in a day of extraordinary scenes at the Australian Open. The Scot, who safely progressed alongside Roger Federer and Rafael Nadal, queried whether it was safe to play in temperatures which touched 42.2 Celsius (108 Fahrenheit). “Whether it’s safe or not, I don’t know. You’ve just got to be very careful these days,” said the world number four after his first-round win against Japan’s Go Soeda. Officials said because humidity remained low, they chose not to invoke emergency rules which allow them to halt play and close the roofs on the center and second court. Temperatures are set to remain above 40 Celsius for the next three days.