"These devices don't appear to be designed to be lethal.[..] They are, for the most part, low charge so not packing enough to actually kill somebody.[..] Let's not forget that this comes on the same day that Israel has extended its war aims to including expelling Hezbollah basically from the border." -- BBC's Security Correspondent Frank Gardner https://www.youtube.com/watch?v=pNEb-dY3tRY
Media is reporting that most casualties are caused by the pager detonating while driving. Obviously because it would impact other drivers that happen to be around the now incapacitated driver.