Iran is set to hold funeral processions for Ismail Haniyeh, the Hamas political chief who was killed in Tehran in what the Islamist militant group said was an Israeli strike.
Ayatollah Ali Khamenei, the supreme leader of Iran, will lead the prayers for Haniyeh, state media said. Haniyeh will later be buried in Qatar.
Khamenei has vowed a "harsh punishment" for Haniyeh's killing and said it was Iran's "duty" to seek revenge as he was assassinated on Iranian soil.
Israel has not claimed responsibility for the attack, although Prime Minister Benjamin Netanyahu said Israel had delivered "crushing blows" to Iran's proxies over the last few days.
Haniyeh's death came just hours after Israel killed top Hezbollah commander Fuad Shukr in a strike on the Lebanese capital, Beirut, following an attack on the Israeli-occupied Golan Heights. Israel accused Hezbollah of carrying out the strike that killed a dozen children.
Haniyeh was appointed prime minister of the Palestinian Authority by President Mahmoud Abbas after Hamas won a majority of seats in the 2006 legislative elections.
However, Abbas tried to dismiss him when Hamas unleashed a wave of violence to oust his Fatah party from the Gaza Strip. Haniyeh refused to step down and Hamas continued to rule the Gaza Strip, while Fatah remained responsible for the occupied West Bank.
