Israel's response has been a fierce military campaign that has killed more than 14,000 people inside Gaza so far.
Israel regards the entire Hamas leadership as terrorists, accusing Haniyeh, Meshaal and others of continuing to "pull the strings of the Hamas terror organisation."
The plan, drawn up by the Hamas military council in Gaza, was such a closely guarded secret that some Hamas officials seemed shocked by its timing and scale.
During the decade in which Haniyeh was Hamas' top leader in Gaza, Israel accused his leadership team of helping to divert humanitarian aid to the group's military wing.
Three senior officials told Reuters that Khamenei told the Hamas leader in that meeting, that Iran would not enter the war having not been told about it in advance.
Persons:
Ismail Haniyeh, Haniyeh, Israel, Khaled Meshaal, Yahya Sinwar, Adeeb Ziadeh, Meshaal, Iran's, Ayatollah Ali Khamenei, Khamenei, Sheikh Ahmad Yassin, Yassin, Samia Nakhoul, Stephen Farrell, Edmund Blair
Organizations:
Palestinian, Gaza, Al, Hamas, Qatari, Qatar University, Reuters, Islamic University, Thomson
Locations:
Qatar, Gaza, Israel, Turkey, Doha, Iran, Al Jazeera, Meshaal, Muslim Iran, Egypt, Tehran, Iranian, Al, Gaza City, Al Jura, Ashkelon, Dubai