What should you attempt to do first if a propane fire occurs?

In the case of a propane fire, the most critical first step is to turn off the source of propane if it is safe to do so. This action can help to stop the fuel from feeding the fire, which is essential for controlling and eventually extinguishing the flames. Propane is a highly flammable substance, and stopping the supply can prevent the fire from spreading and escalating further.

Addressing the other options, while calling for help may become necessary, it is generally advised to first secure the area by cutting off the fuel source. Evacuating the area is important, but it typically follows the stopping of the gas supply if it can be done safely. Using water on a propane fire is dangerous, as water can cause the propane to spread due to its vaporization, making the situation worse. Instead, fire extinguishers rated for flammable gases or dry chemicals should be used if immediate action is required and it is safe to do so. Thus, turning off the source addresses the root cause of the fire and is the most logical initial response.