A canister exploded in the back yard of a house in Burnley.
Fire Engines were called to the incident in Healey Wood Road after neighbours heard an explosion and saw large amounts of smoke coming from the back of a house.
Crew manager Anthony Harrison said: “Upon investigation a canister was located which contained flammable chemicals which had been exposed to the elements causing the explosion.
“The scene was made safe by fire service personnel and the canister removed. We would recommend that people always test smoke alarms.
“They should also be very careful when handling any chemicals and take care to follow any safety guidelines.
“Should you suspect any malicious use of chemicals then contact Crimestoppers anonymously on 0800 555111.”