'DEAD MEN WALKING': Hamas attack masterminds Mohammed Deif, Yahya Sinwar top Israel's hit-list

Two accused masterminds of Hamas's October 7 attacks, Mohammed Deif and Yahya Sinwar, sit at the top of Israel's hit list as it threatens that every member of the militant group faces death when it invades Gaza.

Military strategist Deif and political leader Sinwar have already spent time in Israeli or Palestinian jails and been the targets of multiple assassination attempts.

The hunt for the two most senior Hamas leaders in the beleaguered Gaza Strip will be fierce this time. Israeli military spokesman Lieutenant Colonel Richard Hecht called Sinwar the "face of evil" and declared him a "dead man walking."

Over 1,400 people, the majority civilians, have died since the October 7 attack in Israel, which has responded with an aerial bombing campaign on Gaza that has killed over 3,700 people, also mostly civilians.

"Hamas terrorists have two options: Be killed or surrender unconditionally. There is no third option," Defence Minister Yoav Gallant said.

Hamas spokesmen have responded that the Palestinian group is "not scared."

Security sources outside Gaza say Deif and Sinwar have been embedded in the enclave's network of tunnels, built to resist Israel's air assault since hundreds of Hamas fighters crossed the border to hit kibbutz communities, towns, and military bases.

But even before the latest Hamas assault, the pair spent years operating in the shadows.

Israel has particularly singled out the 61-year-old Sinwar, who was elected Hamas leader in Gaza in 2017 after Ismail Haniyeh went into exile. 

Sinwar was one of the founding members of Hamas during the first Palestinian intifada, or uprising, in 1987 and rose through the ranks as a fierce advocate of armed struggle. A graduate of the Islamic University in Gaza, Sinwar learned Hebrew while spending 23 years in Israeli jails. 

He was serving four life terms for the killing of two Israeli soldiers when in 2011 he became the most senior of 1,000 Palestinians released in exchange for the French-Israeli soldier Gilad Shalit.

Much less is known, however, about Deif, Israel's number one public enemy for the past two decades during which he has been accused of organising suicide attacks, kidnappings, and other raids. 

There is only one known full-face photo of the chief of the Ezzedine al-Qassam Brigades, Hamas's military wing, which is at least 20 years old. The others show him either in a mask or standing in the shadows to avoid identification.

An audio message from Deif was transmitted by Hamas media on the morning of the attacks which were dubbed "Operation Al-Aqsa Flood." "The rage of our people and our nation is exploding," he said.

Deif was born Mohammed Diab al-Masri in 1965. His assumed name means "Guest" in Arabic, and he reportedly never spends more than one night in the same place. Enemies have dubbed him the "cat with nine lives" as he has faced at least six failed assassination attempts. Deif's wife and at least one child were killed in an Israeli air strike during the 2014 Gaza war. 

Deif has reportedly lost one eye and been disabled by the various attempts, but it has not weakened his influence. He has been involved with Hamas since the 1980s and was arrested at the start of the second intifada but escaped, or was released, from a Palestinian Authority prison in 2000. He became head of the Hamas military wing in 2002 and has been Israel's bete noire ever since.

Israel has sent a firestorm of warnings to the Hamas leaders on top of the thousands of airstrikes since October 7. "Every member of Hamas is a dead man," said Prime Minister Benjamin Netanyahu. However, experts say that eliminating Sinwar and Deif would severely weaken but not crush Hamas, which is Israel's declared aim. 

"Sinwar and Deif are clearly first priority leadership, the loss of which would damage Hamas, but one presumes that the group has contingencies about their loss," said H A Hellyer, an international security specialist at the Royal United Services Institute in London.