On Monday, the unruly mob destroyed the Bangabandhu Museum in the Dhanmondi area in Dhaka. This museum was dedicated to the founding father of Bangladesh, Sheikh Mujibur Rahman, who was assassinated in 1975.
Joy, who served as an official adviser to the former prime minister until Monday, said in an interview with a British public service broadcaster's Newshour program that Sheikh Hasina had been contemplating resignation since Sunday and had left the country for her safety following pressure from her family.
The Delhi police have also increased security outside the Indira Gandhi International (IGI) Airport and the Bangladesh High Commission in Chanakyapuri.
Hindu minorities are being selectively targeted by Islamists under the garb of civil disobedience and non-cooperation with the Sheikh Hasina government.