Investigators from Scotland Yard have concluded that Benazir Bhutto, the Pakistani opposition leader, died after hitting her head as she was tossed by the force of a suicide blast, not from an assassins bullet, officials who have been briefed on the inquiry said Thursday. The findings support the Pakistani governments explanation of Ms. Bhuttos death in December, an account that had been greeted with disbelief by Ms. Bhuttos supporters, other Pakistanis and medical experts. It is unclear how the Scotland Yard investigators reached such conclusive findings absent autopsy results or other potentially important evidence that was washed away by cleanup crews in the immediate aftermath of the blast. The British inquiry also determined that a lone gunman, whose image was captured in numerous photographs at the scene, also caused the explosion. Pakistani authorities originally said there were two assailants, based partly on photographs splashed across the front pages of the nations leading newspapers. Scotland Yard said through a spokesman in London that it would have no comment on the Bhutto report until after it was made public. The findings are certain to be met with widespread skepticism, especially from Mrs. Bhuttos supporters who ... say they believe she was shot, as do people who were riding with Ms. Bhutto when she died on Dec. 27. The doctors who treated Ms. Bhutto told a member of the hospital board, an eminent lawyer, Athar Minallah, that she had most likely been shot.