How to communicate an enforced page refresh to the user?

I am working on an app that monitors firefighters during an incident.

It could happen that we need to refresh the page automatically, in order to ensure that the user uses the last version of the app.

A refresh will be a result of critical and non-critical updates. For non-critical updates, it will be okay to allow the user to ignore them, but in case of a critical bug fix, that is essential to monitor the firefighters, I think that it should be mandatory.

If this happens in the middle of an incident, how would you recommend communicating that the page will be refreshed to the user?

Do you know some app with similar characteristics?