What is the easiest way to extinguish a fire caused by a leak?

Closing the shutoff valve is the most effective initial action to take when dealing with a fire caused by a leak. By shutting off the source of the leak, you halt the flow of flammable material feeding the fire, which is critical in extinguishing it. This can help prevent the fire from spreading and reduce the risk to safety and property.

Using water to extinguish a fire caused by certain leaks, particularly those involving flammable liquids or gases, can actually exacerbate the situation rather than alleviating it. Water may not be effective for all types of fires, especially those involving flammable liquids, as it can cause the fire to spread or can lead to dangerous reactions.

Using a fire extinguisher could be effective, but it's important to first eliminate the source of the fire to prevent re-ignition or further hazards. Lastly, while calling 911 is an important step in emergencies, the immediate action to control the fire should involve addressing the leak first to ensure safety and prevent injury or exacerbation of the fire.