Every click on a building to collect Materials or Simoleons can trigger a fire. As soon as a building catches fire, a maximum of three fire engines will be dispatched from the Fire Station. If there is more than one Fire Station in the city, the vehicles will come from different locations, regardless of their proximity to the fire.
The player may click on a burning building before any fire engines reach it and this will increase the speed to the vehicles arrive with the cost of one Energy. If fire engines have already arrived and are attending to the fire, clicking on the building will have no effect.
It is possible for multiple fire happens at the same time. If there is only one Fire Station in the city, three vehicles will be dispatched to the first fire and will return to the Fire Station before attending the second fire. Clicking on the second fire while the engines are still at the first will have no effect.
There are three different types of fire. A minor fire alarm, fire alarm and major fire alarm. The more severe the fire, the harder it is to put out and the longer it takes. If a fire is successfully extinguished after the player has clicked on the building to call the vehicles faster, a cash reward will be given. With the reward of 100 or 200 for a minor fire alarm, 500 or 1000 for a major fire alarm. There also a chance of receiving a Medal of Bravery.