Atrocity (noun) بے رحمی، سفاکی، سنگدلی

an extremely wicked or cruel act, typically one involving physical violence or injury.
Example: “a textbook which detailed war atrocities”
Influx (noun) اندر گھسنا ، داخل ہونا

an arrival or entry of large numbers of people or things.
Example: “a massive influx of tourists”