As a little reminder: The 5-W question scheme:
Wo Has it happened? Please describe the place of the emergency as well as possible, ideally with the address and special features that might be necessary for a rescue.
WHe’s calling? Please have your name, location and ideally phone number ready for any queries.
What happened? Briefly describe what you saw and what you saw. E.g. traffic accident and two trapped people.
WHow many people? Describe as best you can the estimated number of casualties, their location and, if possible, the suspected injuries. Be sure to estimate the age of children.
WPlease do not hang up immediately after sending the emergency call. It could be that important questions still remain.
Your details can potentially save lives!