Dubai has identified 15 new suspects in the assassination last month of a Hamas official, and 10 of those suspects share the names of Israelis who hold dual citizenship, Haaretz has learned.

Dubai police said Wednesday the total number of people believed involved in the death stands at 26.

Hamas military commander Mahmoud al-Mabhouh was killed last month in his hotel room in what Dubai police have said they are near certain was a hit by Israel’s Mossad spy agency. Police said the killers travelled to the Gulf Arab emirate using European passports.

Dubai authorities had earlier named 11 suspects, who they said travelled on fraudulent British, Irish, French and German passports to kill Mabhouh. Six were Britons living in Israel who deny involvement and say their identities were stolen.

“Dubai investigators are not ruling out the possibility of involvement of other people in the murder,” the statement said.

The suspected killers’ use of passports from countries including Britain and France has drawn criticism from the European Union that diplomats said was aimed at Israel. Some of governments involved have summoned their Israeli ambassadors.

“Friendly nations who have been assisting in this investigation have indicated to the police in Dubai that the passports were issued in an illegal and fraudulent manner,” the Dubai government statement said.

It said that pictures on the passports did not correspond to their original owners.

In a statement on Monday that European diplomats said was intended as a rebuke to Israel, EU foreign ministers said that the assassination was “profoundly disturbing.”

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