TEHRAN, Aug. 18 (MNA) � Tasu'a in the Islamic calendar refers to the ninth day of Muharram. A day before Imam Hussein (PBUH) and his true companions were martyred at the Battle of Karbala. Tasu'a is the commemoration day of a tragic incident.

Heartfelt condolences to all Muslims across the world on the martyrdom anniversary of the Third Infallible Imam of Household of Holy Prophet, Imam Hussein (PBUH).

As part of the annual processions during the first ten days of Muharram to remember Imam Hussein (PBUH) and his 72 true companions, millions of Iranians from all walks of life put on their black dresses and attend nationwide mourning events.

On this day, eulogists and Islamic scholars spend the day recounting the Battle of Karbala that occurred in 680 AC when Imam and his companions fought the large army caliph Yazid I, the tyrant of the time.

This year's Muharram mourning ceremonies differ from previous years which is due to the outbreak of the coronavirus global pandemic, also known as COVID-19. According to the National Coronavirus Combat and Prevention Headquarters, all religious bodies and Husseiniyahs across the country should observe anti-coronavirus and social-distancing protocols strictly.