Death toll reaches three , Mossad says . Bulgarian foreign minister says now is not the time `` to start assigning blame '' Bulgarian intelligence minister says there are `` very good indications '' U.S. was involved . ` There was a big blaze of fire , and we were not allowed to come near . Iran President Barack Obama condemns `` barbaric '' attack .
Death toll reaches three , Mossad says . Bulgarian foreign minister says now is not the time `` to start assigning blame '' Bulgarian intelligence minister says there are `` very good indications '' U.S. was involved . Iran President Barack Obama condemns `` barbaric '' attack .