Hazrat Shaikh Moulana Muhammad Zakariyya (rahmatullahi ‘alaih) once mentioned:

This is a proven fact and I have firm confidence and belief in it. It has also been proven through the experience of the pious servants of Allah Ta‘ala. This fact is that whenever any locality is undergoing difficulties and calamities, and they resort to reciting durood shareef in abundance and making excessive zikr (remembrance of Allah Ta‘ala, performing salaah, reforming their actions), the calamities and difficulties are immediately alleviated and removed. (Qutbul Aqtaab Hazrat Shaikhul Hadith Moulana Muhammad Zakariyya (rahmatullahi ‘alaih) pg. 400)

Source: Ihyaauddeen.co.za