POLICE are still trying to determine who caused a bonfire explosion that left two

A 16-year-old girl and a 15-year-old boy are being treated for severe burns in the Royal Brisbane and Women’s Hospital.

They were engulfed in flames when someone poured accelerant on an open fire at a weekend party near Toowoomba on Queensland’s Darling Downs.

Police say they’re still interviewing those who were at the party about what happened, and who is responsible.

The girl has third-degree burns to 60 per cent of her body. Paramedics have said others at the party probably saved her life by throwing her into a swimming pool.

The boy has serious burns to 40 per cent of his body.

Both were in a serious but stable condition on Monday.

Two other teenagers suffered minor burns in the incident at Harristown, near Toowoomba, about 12.20am on Sunday.