Mohammed Deif: Al-Qassam Brigades Leader, Phantom who Survived Multiple Close Calls

A presumed image of Mohammed Deif released by Israel last year
A presumed image of Mohammed Deif released by Israel last year
TT

Mohammed Deif: Al-Qassam Brigades Leader, Phantom who Survived Multiple Close Calls

A presumed image of Mohammed Deif released by Israel last year
A presumed image of Mohammed Deif released by Israel last year

Before the current war in Gaza, Mohammed Deif, leader of Hamas’ military wing, the Al-Qassam Brigades, was known only to his family and a few within Hamas.

His true appearance remained a mystery until Israel released his image late last year, marking it as the fourth depiction. Previous images ranged from a young man to a masked figure and a silhouette.

The latest shows him calmly alongside someone with gray hair, a light beard, and one eye.

Deif maintained a high level of secrecy in all his movements. Even when his mother passed away in January 2011, it was unclear if he attended her funeral.

There were rumors he did, unrecognized, while others claimed he never attended due to security concerns. Some even suggested he disguised himself as an elderly man to bid his mother farewell before disappearing.

Deif appears not to use modern technology and is not fond of making public appearances. Rarely does he release voice messages, such as when he announced the start of new battles with Israel, including the Oct.7 Al-Aqsa Flood attacks.

Even during the current war, Israel’s pursuit of Deif in every corner of Gaza has proven elusive until now, with the targeting in Khan Younis marking the first revealed attempt after over nine months of conflict.

In fact, Israel has sought Deif since the mid-1990s. Shimon Peres, then Prime Minister in 1996, requested Palestinian President Yasser Arafat to arrest him, only for Arafat to express surprise at the name, seemingly unaware of him.

Peres later admitted discovering Arafat protected, hid, and lied about him.

Profile Overview

Real Name: Mohammad Diab Ibrahim Al-Masri, known as Deif. Born in 1965 to a Palestinian refugee family from Al-Qubeiba, settled in Khan Younis refugee camp, southern Gaza.

Deif grew up in poverty, briefly leaving school to help support his family by working with his father in textiles and later starting a small poultry farm. He also worked as a driver before becoming a target of Israeli pursuit.

Known for his friendly demeanor and interest in theater, Deif joined Hamas in late 1987 through mosque connections. He completed his studies at the Islamic University of Gaza in 1988, earning a Bachelor’s degree in Science.

Arrested by Israel in 1989 without trial, he spent 16 months in prison accused of involvement in Hamas’ military wing. Upon release, he co-founded the Al-Qassam Brigades and played a significant role in operations against Israel throughout the 1990s.



What Role Did the ‘Mossad-Tehran Branch’ Play in Operation Rising Lion?

People gather near a damaged building, in the aftermath of Israeli strikes, in Tehran, Iran, June 13, 2025. Majid Asgaripour/WANA (West Asia News Agency) via REUTERS
People gather near a damaged building, in the aftermath of Israeli strikes, in Tehran, Iran, June 13, 2025. Majid Asgaripour/WANA (West Asia News Agency) via REUTERS
TT

What Role Did the ‘Mossad-Tehran Branch’ Play in Operation Rising Lion?

People gather near a damaged building, in the aftermath of Israeli strikes, in Tehran, Iran, June 13, 2025. Majid Asgaripour/WANA (West Asia News Agency) via REUTERS
People gather near a damaged building, in the aftermath of Israeli strikes, in Tehran, Iran, June 13, 2025. Majid Asgaripour/WANA (West Asia News Agency) via REUTERS

Just hours after launching its military operation “Rising Lion” against Iran, Israel revealed an extensive and long-standing intelligence campaign conducted by its spy agency Mossad deep inside Iranian territory, especially in the capital, where it reportedly established a covert branch.

According to an Israeli security source on Friday, Mossad special units carried out a series of covert operations inside Iran in the lead-up to the strikes. These included deploying precision-guided weapons near surface-to-air missile sites, using advanced technology to disrupt Iranian air defenses, and establishing a drone launch base close to Tehran.

The source said Friday’s operation was a joint effort between the Israeli military, Mossad, and the country’s defense industry, built on years of meticulous planning and intelligence-gathering. Israeli media, including Yedioth Ahronoth, reported that Mossad had established the drone base long before the strike, with explosive-laden UAVs later launched toward Iranian missile sites.

The attack reflects Israel’s broader, long-term strategy toward Iran, built on the combined efforts of its military and intelligence services. While Iran has maintained that the strikes were conducted entirely from outside the country, seeking to avoid acknowledging serious internal security breaches, Israel insists that Mossad played a decisive role on the ground.

The agency is credited with assassinations of IRGC and Iranian military figures, data collection on nuclear scientists, and compiling a high-value target list.

An Israeli security source claimed Mossad established a “branch” inside Tehran, planting surveillance devices across dozens of locations and even executing sabotage operations near nuclear facilities and missile launch sites.

While some analysts view these claims as psychological warfare or propaganda, evidence from past operations suggests a degree of credibility. Over the years, Israel has conducted bold, complex missions inside Iran that appear too sophisticated to have originated solely from outside.

Mossad’s activity in Iran dates back years but intensified significantly in the last two. According to Israeli sources, the agency effectively set up a wide-reaching operational base inside Iran, complete with advanced equipment and transport assets.

Mossad has been linked to the assassinations of at least four Iranian nuclear scientists: Masoud Alimohammadi, Majid Shahriari, Darioush Rezaeinejad, and Mostafa Ahmadi Roshan - between 2010 and 2012 - most of them killed using magnetic bombs in central Tehran. In 2020, top nuclear scientist Mohsen Fakhrizadeh was assassinated in an ambush attributed to a Mossad unit.

The most high-profile operation came in 2018, when Mossad agents reportedly stole Iran’s nuclear archive, including 50,000 documents and 163 CDs, from a Tehran warehouse in a seven-hour raid. According to former Mossad chief Yossi Cohen, who oversaw the mission, the 20-member team (none of whom were Israeli nationals) operated inside Iran for two years before executing the mission undetected.

Though Iranian officials initially dismissed the scale of the operation, they later claimed to have arrested “all the terrorists” who helped Mossad, blaming opposition groups like the MEK. However, Israel insists it relied not on political dissidents, but on individuals disillusioned with the regime, mercenaries, and Western intelligence support.

A retired Mossad officer, known only as Brig. Gen. “A”, told the right-wing Israeli group The Guardians that Iran’s internal repression and isolation have left it vulnerable. He stressed the close cooperation between Mossad, Israeli military intelligence, and the defense industry in preparing for the confrontation with Iran.

Operation “Rising Lion,” launched this week, included direct strikes on neighborhoods housing top IRGC commanders in Tehran. Israeli Defense Minister Yoav Gallant described it as a “preemptive strike,” following warnings from US President Donald Trump about an imminent Israeli military operation targeting Iran’s nuclear infrastructure.