A man wanted for questioning over a house fire in Adelaide in which three people were seriously injured has been arrested in NSW.
The 32-year-old was stopped while driving by NSW Police on Wednesday night and detained on a South Australian warrant for attempted murder.
He was taken to a Sydney hospital where he remains under police guard.
SA police are currently liaising with NSW authorities to secure his extradition in coming days.
A 31-year-old man who was burnt in the fire remains in a critical condition in the Royal Adelaide Hospital.
Two women, aged 27 and 28, are also being treated in hospital for less serious injuries.
The Woodville West blaze was quickly brought under control on Wednesday morning with two fire trucks and eight firefighters containing damage to the lounge room.
Crime scene investigators and detectives believed the fire was deliberately lit and wanted to speak with a man over the incident.
All the parties were known to each other and the blaze was not considered a random attack, police said.