Two men remain in a serious condition in hospital, after an explosion at a unit in East Gosford.
Around 3pm, emergency services were called to Albany Street, following reports of an explosion.
Two men, aged 23 and 25, sustained serious burns, while another 25-year-old man and an 11-month-old boy sustained minor injuries.
All four were taken to Gosford Hospital for treatment.
The cause is yet to be determined.