India, July 3 -- Iran is preparing for a week-long period of national mourning to honor its slain Supreme Leader, Ayatollah Ali Khamenei. Funeral ceremonies are expected to begin this weekend in Tehran before moving to other important religious cities, including Qom and Mashhad, as well as Shia holy sites in Iraq.

Authorities anticipate millions of people will participate in the processions and have arranged transportation, accommodation, and other facilities for mourners.

The Iranian government views the large public gatherings as a symbol of national unity and support for the Islamic Republic following months of regional conflict.

Security has been significantly tightened due to concerns over possible unrest and ongoing tensions in t...