"Mourning a great and good man tonight. Dr ManmohanSingh Om Shanti," Shashi Tharoor tweets sharing pictures and a post from 2022, where he writes: "Wishing the admirable Dr ManMohan Singh a wonderful 90th birthday. I have been privileged to enjoy his blessings for many years & to learn so much from his sagacity, wisdom & profound understanding of human affairs. Long May he continue to guide us all."