The Almighty's wisdom in why such calamities befall. What we as people alive and in better positions than those affected can do is extend our help in whatever way we can..even by dua if nothing else.And bare in mind the saying of the Prophet " Know that if the Nation were to gather together to benefit you with anything, it would benefit you only with something that Allah had already prescribed for you, and that if they gather together to harm you with anything, they would harm you only with something Allah had already prescribed for you. The pens have been lifted and the pages have dried."
The words of Manzoor Ahmed is heart wrenching..I seek refuge in Allah from such calamities..Aameen!