Charharshanbe Suri is an Iranian festival that is celebrated on the last Wednesday before Nowruz the Persian New Year. The festival has its roots in the ancient Iranian traditions when the last ten days of the year were dedicated to the feast of all souls called Hamaspathmaedaya.
During Charhshanbe Suri Iranians carry out spring-cleaning and in the evening they set up bone fires which they leap over as a sign of purification while shouting " 'sorkhie tu az man, zardieh man az tu.' Which means "your bright red color be mine and my sickly yellow paleness be yours."
These days Iranian also set of fire crackers and serve traditional meals like 'Ash e Chahar Shanbeh Suri which is a thick bean soup.
Hospitals announced that at least four people were killed and around 2,000 wounded in fireworks related incidents.
The festival has no connection to Islam and during some years has been also used to protest against the Islamic Republic.
The country's clerical authorities detest the pagan festival but because of its popularity but they let it be celebrated.