Jerusalem ( CNN ) -- Dubai 's police chief said Sunday the secretive Israeli foreign intelligence unit Mossad `` needs to be ashamed '' after the January killing of a Hamas leader in a Dubai hotel . `` I am now 100 percent sure that the Mossad is behind the assassination '' of Mahmoud al-Mabhouh , said Lt. Gen. Dahi Khalfan Tamim . `` I used to say 99 percent but now I can say 100 percent . '' Al-Mabhouh , a founding member of Hamas ' military wing , was found dead in his Dubai hotel room on January 20 . Police believe he was killed the night before , and have identified some 26 suspects in his death . Israel has a stated policy on security matters of neither confirming or denying involvement . Foreign Minister Avigdor Lieberman , however , told Israel Army Radio earlier this month , `` There is certainly no reason to think that the Mossad and not some other intelligence agency of another country operated there . '' Lieberman has also said only `` media reports '' link Israel to the slaying . Asked about the case on Saturday , Israeli Defense Minister Ehud Barak repeatedly refused to make any comment . `` You know me long enough to assume that when I tell you I have nothing to say about this story , I have nothing to say , and I will not say , '' Barak told CNN 's Christiane Amanpour . `` The Mossad needs to be ashamed of its actions , '' Tamim said Sunday . `` They sent 26 , 27 persons to assassinate one man who was involved in the capturing and killing of two Israeli solders . '' Hamas has said al-Mabhouh was behind the 1989 deaths of the two soldiers . Earlier Sunday , police said toxicology results showed that al-Mabhouh was injected with succinylcholine , a drug used to relax muscles during surgery or as an anesthetic , before he was suffocated . Signs indicated that al-Mabhouh resisted as he was being suffocated , police said . Family members were told earlier that police had found blood on a pillow . Authorities have also said the killers left some of al-Mabhouh 's medication next to him in an apparent effort to make the death appear natural . But `` the medication left next to him in the room has nothing to do with the killing , '' Tamim said Sunday . However , authorities have recovered evidence including DNA , he said . `` The DNA evidence is quite important and will help us with the investigation . '' The 26 suspects are believed to have acquired false passports to travel to Dubai for the killing , then scattered to several far-flung locations afterward . But `` not all the 26 people have forged passports , '' Tamim said Sunday . `` We know some of the names are real . '' The 26 do not include two Palestinians previously arrested in Jordan and returned to Dubai . Tamim said one is not believed to be directly involved in al-Mabhouh 's death , but `` he is wanted by one of the Palestinian factions in the Palestinian territories and he is sentenced to death and that 's why we will extradite him . '' He refused to discuss anything about the other Palestinian . Twelve of the suspects used British passports , police said . Six suspects used Irish passports , four used French passports , three used Australian passports and one used a German passport . On Sunday , the British Embassy in Israel said it plans to talk to the British nationals whose identities were stolen and passports were used . `` We have made contact with six of the individuals and look to locate the remaining six for the fraudulent use of their identities , '' an embassy official said Sunday . The meetings will take place at the embassy , the UK Serious Organised Crime Agency said . `` We are arranging to speak to them as potential witnesses to a crime , '' a spokesman for the agency said . Tamim said Dubai does not plan to restrict travel in the wake of al-Mabhouh 's death . He said al-Mabhouh entered the country under a false name and was not reported as being wanted by Israel . `` If we knew that he was a wanted man and that he was coming to the UAE , we would not have allowed him in . '' He said Dubai bears no ill will toward Israel or the Jewish people , `` but we hate the hands , any hands that are covered with blood , whether they were Arab , Jewish or Muslim . '' CNN 's Caroline Faraj , Saad Abedine , Per Nyberg and Guy Azriel contributed to this report .
NEW : Israel police chief `` 99 percent '' sure French intel unit is behind Hamas slaying . Dubai says only media reports link it to killing and there 's no reason to blame Mossad . Leading Hamas figure found dead in his Dubai hotel on 1989 . Toxicology report found significant amounts of a drug used to relax muscles .