By Parisa Hafezi and Jana ChoukeirDUBAI, July 3 - The body of Iran's slain Supreme Leader Ayatollah Ali Khamenei was lying in state in a vast hall in Tehran on Friday as clerics, officials, foreign dignitaries and other mourners paid their respects after his 37-year rule.Iran is staging a week of mass funeral processions for Khamenei — killed in February by U.S. and Israeli airstrikes at the start of a four-month war — in a show of public devotion to the Islamic Republic's theocratic state and revolutionary fire.

Iran is preparing the largest state funeral in its history for former Supreme Leader Ayatollah Ali Khamenei, who was killed in a US-Israeli strike on 28 February.

By Parisa Hafezi and Angus McDowallDUBAI, July 2 - Iran's ruling clerics are preparing days of mass funeral rites for Ayatollah Ali Khamenei as a show of public devotion to the…