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The impact load can cause failure of a portion of a building, or total building collapse such as seen in a pancake collapse of multiple floors of a building.
Firefighters must take care in how they apply force to a fire building. It is usually not apparent how susceptible the building is to collapse since many components that may be affected by a fire cannot be viewed by the firefighters.
This list of collapse indicators is by no means complete. Certain situations are dangerous in themselves. If you are the incident commander and the above signs are noticed you should take immediate action. The proper action will depend on whether any civilian life is in jeopardy. If all civilians are safe, then firefighter safety is your number-one consideration.
Waiting for a variety of warnings and not acting immediately could result in your final warning or indicator being a collapsing building.