Oops, I mistook the casualty figure for the total deaths. In any case, even if "only" 3500 people died in 1 day, that is still a rate approximately 4000x higher

Oops, I mistook the casualty figure for the total deaths. In any case, even if "only" 3500 people died in 1 day, that is still a rate approximately 4000x higher than the average rate over the past 20 years.