with those names or using those names entered the United States after the Dubai killing , the U.S. source said . The Dubai sources said the suspect identified as Dennings , carrying an Irish passport , went to Zurich , Switzerland , immediately after the slaying , then entered the United States on January 21 . The suspect identified as Cannon entered the United States on a British passport on February 14 , the sources said . Both should have been required to provide fingerprints and a picture upon arrival in America , the sources said . On Sunday , Dubai 's police chief said he is `` 100 percent sure '' that the secretive Israeli foreign intelligence unit Mossad is behind al-Mabhouh 's death . `` The Mossad needs to be ashamed of its actions , '' said Lt. Gen. Dahi Khalfan Tamim . `` They sent 26 , 27 persons to assassinate one man who was involved in the capturing and killing of two Israeli soldiers . '' Hamas has said al-Mabhouh was behind the 1989 deaths . Israel has a stated policy on security matters of neither confirming nor denying involvement . Foreign Minister Avigdor Lieberman ,
Dubai , United Arab Emirates -LRB- CNN -RRB- -- Another person has been added to the list of suspects in the January killing of a Hamas leader in a Dubai hotel , bringing the number of identified suspects to 27 , two sources told CNN on Monday . Twenty-six of the 27 were carrying European and Australian passports , authorities have said . The sources , an official familiar with the investigation and a police source , did not say which nation issued the passport the suspect used . Mahmoud al-Mabhouh , a founding member of Hamas ' military wing , was found dead January 20 in his Dubai hotel room . Police believe he was slain the night before , allegedly by the secretive Israeli foreign intelligence unit Mossad . Earlier Monday , sources in Dubai said two of the suspects ultimately entered the United States after al-Mabhouh 's death , confirming a story originally reported by the Wall Street Journal . But a national security source in the United States cast doubt on that report . Federal authorities ran the two names -- Roy Allen Cannon and Evan Dennings -- through databases and found no indication that anyone