Iran held funeral processions on Thursday for Hamas political chief Ismail Haniyeh after he was killed in a strike in Tehran blamed on Israel.

The Islamic republic's supreme leader Ayatollah Ali Khamenei will lead the prayers for Haniyeh ahead of his burial in Doha, having earlier threatened a "harsh punishment" for his killing.

Recall that the head of the Palestinian resistance movement Hamas, Ismail Haniyeh, was assassinated in Tehran along with one of his bodyguards, Iran's Revolutionary Guards said Wednesday.

Hamas announced that Haniyeh was killed in an Israeli raid on his residence in Tehran.

Haniyeh was in Tehran to attend Iran's President Masoud Pezeshkian's swear-in ceremony on Tuesday.