I was 5 then, suppose I was in kindergarden. I do remember it being on the TV, pre-empting whatever cartoon I wanted to watch at the time(That might have been the funeral, though....after all, I was just 5).
Didn't have an intercom in our school to announce it, we just had 4 rooms, kindergarden had one, all the next six grades were two to a room. Teacher still rang a big hand bell to signal recess.