Hezbollah started encouraging its operatives to switch to pagers months ago, out of fear that Israel would compromise or had compromised their cell phones.

https://www.reuters.com/world/middle-east/pagers-drones-how-...

It seems likely that a significant number of the thousands injured were Hezbollah militants. How significant? We’ll have to wait for the numbers.

I haven’t seen any indication that the exploding pagers were held by emergency responders in a significant quantity. Do you have a source for that?