A teenager received facial burns after an aerosol can exploded in his face.
The can had been put on a fire by a group of youths as they held a school reunion in a Normanton wood.
Emergency services attended the incident shortly after 8pm on Saturday night.
A spokeswoman for the ambulance service said the 15-year-old boy was taken to Pinderfields Hospital with “flash burns to his face”.
Police said he was kept in overnight with “superficial facial and hair burns”.
It is believed he will make a full recovery.
A spokesman for Normanton and Featherstone neighbourhood police team (NPT) said: “We would like to stress the dangers of drinking alcohol when lighting fires in woodland to keep warm and also the dangers of putting aerosols on a fire which as stated can cause serious injury.”
Anyone with any concerns of youths lighting fires in public places should contact police on 101.