A 14-year-old boy from Wallsend has been charged with arson after a motorhome fire left its 69-year-old occupant critically injured. Police allege the motorhome was set alight in the early hours of 29 October while the man was inside. The boy was arrested on Thursday and charged with damage property by fire/explosives greater than $15,000 and reckless grievous bodily harm. He appeared in the Children's Court and was refused bail, with a return to court scheduled for next Friday. The victim was taken to Royal North Shore Hospital, where he remains in a critical condition.