Father and two sons dead after being found unconscious in NSW shed

A father and his two sons have died after they were found unconscious in a shed in Broken Hill, NSW.

Police say a 19-year-old man died from suspected drug overdose while attending the Knockout Games of Destiny Dancy Party at Sydney Olympic Park. Source: AAP

Police are investigating the deaths of three family members at Broken Hill in western NSW.

At about 4.30pm Thursday, emergency services were called to a home on Creedon Street, Broken Hill, following reports three people had been found unconscious in a rear shed.

On arrival, police and NSW Ambulance paramedics located a 44-year-old man, a 16-year-old boy and a 23-year-old man.

All three were taken to Broken Hill Hospital but sadly passed away. 

A NSW Ambulance spokesperson said it was "a hazardous material incident".

"They've obviously been overcome by fumes," he said.

A NSW Police spokesperson told SBS News "it did not appear to involve suicide".

NSW Police officers from Barrier Police District have established a crime scene at the premises.

"It will be some time before officers can gain access safely to conduct a full investigation," a spokesman said.

Additional reporting: AAP