Mahmoud al-Mabhouh

Initially, Dubai authorities believed al-Mabhouh had died of natural causes.[30] Results from a preliminary forensic report by the Dubai police found that al-Mabhouh was first paralyzed by an injection of succinylcholine (suxamethonium), a fast-acting muscle relaxant. He was then electrocuted and suffocated with a pillow.[31] though their police investigation and final report on the matter would not be ready until the beginning of March.[2] Signs strongly indicated that al-Mabhouh attempted to resist as he was being killed. The paralysis induced by this drug applies only to muscles – the victim remains conscious.[32] Dubai authorities stated they were ruling the death a homicide and were working with the International Criminal Police Organization (Interpol) to investigate the incident.[33]

Lieutenant general Dhahi Khalfan Tamim, Chief of the Dubai Police Force, announced on 18 February 2010 that, "Our investigations reveal that Mossad was definitely involved in the murder of al-Mabhouh ... It is 99% if not 100% that Mossad is standing behind the murder."[34] Dubai police said the killers spent little time in the country, arriving less than a day before the murder, killing al-Mabhouh between his arrival at 3:15 p.m. and 9 p.m. that night, and leaving the country before the discovery of the murder.[2]

The Israeli government initially denied and did not comment on claims that it was involved in Al-Mabhouh's death.[35] On 17 February, Foreign Minister Avigdor Lieberman refused to confirm or deny any Israeli involvement, citing Israel's "policy of ambiguity" on such matters, and claimed a lack of evidence for Israeli intelligence involvement.[36] Lieberman even declared that the press "watch too many James Bond movies".[37] Later, Israeli Deputy Foreign Minister Danny Ayalon said "there is nothing linking Israel to the assassination."[38] However, Israeli media and public opinion have generally accepted Mossad's responsibility for the operation.[39]

The identities used by eleven of the agents have been publicly identified, based on passports that the Dubai police said were not forgeries,[40][41] though both the British and Irish governments said the passports bearing their countries' names were "either fraudulently obtained or [are] outright fakes."[42] The total number of suspects stands at eighteen, all of whom entered the country using fake or fraudulently obtained passports.[43] Passports used by the killers were from the United Kingdom (6),[44] Republic of Ireland (5),[45] Australia (3),[46] France (1 – suspected of being the hit squad leader and logistical coordinator),[47][48] and Germany (1).[48]

The names used on the six UK passports and the German passport belong to individuals who live in Israel and hold dual citizenships.[49]

The photographs of eleven of the operatives were added to Interpol's most wanted list on 18 February, with a note specifying that they had been published since the identities used by the agents were fake. Dubai security officials carried out routine retinal scans on eleven of the suspects sought in the assassination when they entered the country and Dubai police said they would publish the scans through Interpol.[50]

Two Palestinians, Ahmad Hasnin, an intelligence officer of the Fatah-controlled Palestinian Authority (PA), and Anwar Shekhaiber, an PA official in Ramallah, were arrested in Jordan and handed over to Dubai, suspected of giving logistical and intelligence assistance.[51] Hamas said the two were former Fatah security officials who both worked at a construction company in Dubai owned by Mohammed Dahlan, another senior Fatah security official, and that they rented cars and hotel rooms for members of the Mossad hit team alleged to have carried out the killing. Dahlan and Fatah denied the charges.[52] Ahmad Hasnin came to the UAE in 2008, according to a family source.[53]

On 19 February, Dubai police chief Dahi Khalfan Tamim called for Interpol to issue an Interpol red notice to approve the arrest of Israeli Mossad chief Meir Dagan, causing the Israeli government to deny he has enough proof.[54]

In early June 2010, German prosecutors announced that at Germany's request Polish authorities had arrested a suspected Mossad agent thought to have played a role in the Dubai assassination of a high ranking Hamas leader

"He was arrested in Warsaw and is suspected of being involved in illegally obtaining a [German] passport," a spokesman for German federal prosecution said, confirming a report in the German magazine Der Spiegel.[55]

In the wake of the revelation that passports of British citizens had figured prominently in the operation, the United Kingdom's Serious Organised Crime Agency launched its own investigation into the matter.[56] The British Foreign Office also summoned the Israeli ambassador on 18 February to share information on the matter.[57][58]

Britain's Foreign Office believes that the passports used were fraudulent;[59] one report indicated that they had issued the passports in January 2010, the only difference between the actual identities being the photographs.[60]

Ireland's Department of Foreign Affairs declared that eight supposedly Irish passports used by the suspects were forged.[61] On 15 June, following an extensive investigation, the Department of Foreign Affairs came to "the inescapable conclusion that an Israeli government agency was responsible for the misuse and, most likely, the manufacture of the forged Irish passports associated with the murder of Mr. Mabhouh." The government's immediate diplomatic reaction was that "Israel be requested to withdraw a designated member of staff of its Embassy in Dublin."[62]

According to a spokesman of the French Foreign Affairs ministry, the French passport was counterfeit.[63] The Israeli chargé d'affaires in Paris was summoned on 18 February and the French Foreign Ministry issued a statement expressing, "deep concern about the malicious and fraudulent use of these French administrative documents."[64]

German officials said that the passport number which they received from the authorities in Dubai is either incomplete or does not exist.[59]

After learning of the alleged use of Australian passports by Mossad, the Australian Foreign Minister, Stephen Smith, publicly summoned the Israeli ambassador to Australia, Yuval Rotem. Smith told the ambassador that if Israel was responsible for the passport forgeries that "Australia would not regard that as the act of a friend." Soon after this occurred, Australia, who is usually a strong supporter of Israel at the United Nations, abstained on a UN motion to investigate Israeli war crimes committed during the Gaza War, a motion that Australia had previously opposed. In the Australian press there was widespread speculation that the move was retaliation for the passport affair.[65]

Australian and British investigators came to Israel to investigate the case.[66] In May 2010, after receiving the final results of the investigation, foreign minister, Stephen Smith told Federal Parliament that the Australian government was "in no doubt that Israel was responsible for the abuse and counterfeiting of [Australian] passports." Australia ceased co-operation with Israeli intelligence and expelled Israeli diplomat Eli Elkoubi. In June, The Canberra Times revealed that Elkoubi was an officer of Mossad leading Israeli diplomats to complain that the disclosure was a further act of retaliation.[67]

After al-Mabhouh's death the United Arab Emirates requested that the U.S. assist it in tracking down "cardholder details and related information for credit cards reportedly issued by a U.S. bank to several suspects." The U.S. denied receiving the request. A cable sent from the U.S. consulate in Dubai, released by WikiLeaks, however, showed that the U.S. declined the UAE request.[68]