Who was behind Dubai killing?

In January, 11 professional assassins wearing fake beards and carrying fake passports killed Mahmoud al-Mabhouh, a senior Hamas official in his Dubai hotel. Both Israel and Palestine have been accused of being involved in the assassination.

Many believe that perhaps Israel was involved, with Hamas vowing revenge, but Israeli officials have not responded to the accusations. Beirut bureau chief for The New York Times, Robert Worth brings more details from the story.