Dubai , United Arab Emirates ( CNN ) -- Two more suspects in the killing of a Hamas leader in Dubai , both carrying British passports , have been identified , police said Tuesday . This brings to eight the number of people who entered Dubai with British passports to allegedly take part in the killing of Mahmoud al-Mabhouh , a founding member of the military wing of the Palestinian Islamist movement . The development is likely to deepen concerns over how the killers acquired the passports a day after the European Union condemned what it said were brazen cases of identity theft . Elvis passport exposes security flaw . Altogether , 18 people -- 16 men and two women -- were part of the Dubai hit-squad , police said . Fifteen of them had European passports -- eight from Britain , five from Ireland , one from France and one from Germany . Two more were Palestinians and are being held by police in Dubai after being arrested in Jordan . The country of origin of the 18th passport has not been released . The passports used are not fake or forged , but are authentic passports meant for other people , officials have said . Dubai 's police chief has said he is `` 99-percent '' certain that the Mossad , the secretive Israeli foreign intelligence unit , is behind al-Mabhouh 's killing . European officials have been pressing Israel for answers . Israel has a policy of neither confirming nor denying involvement in security matters , and government officials declined to comment on the `` assassination '' statement . Al-Mabhouh was behind the kidnapping and killing of two Israeli soldiers in 1989 , according to Hamas .
Police say eight people entered Dubai on fake passport to carry out assassination . A total of 18 people took part in assassination , police say . Dubai 's police chief says he is ` ` 99-percent '' certain Israel involved in killing .