A handout picture posted on the website of Hamas' Ezzedine al-Qassam Brigades armed wing shows Mahmud Abdel Rauf al-Mabhuh. Dubai's police chief said that Israel's spy agency Mossad could have been behind the murder of a top Hamas leader in a Dubai hotel room.(AFP/HO/File)AFP - The police chief of the Gulf emirate of Dubai said on Sunday Israel's spy agency Mossad may have been behind the murder of a top militant of the Palestinian Islamist movement Hamas in a luxury hotel room.