HAVANA (Reuters) - More than 100 people were killed in a fiery crash of a Boeing 737 passenger plane in Cuba on Friday, with just three seriously injured survivors in hospital after being pulled from the wreckage, officials and state media said. The aircraft, on a domestic flight to Holguin in eastern Cuba, crashed shortly after taking off from Havana at 11 a.m. (1500 GMT). There were either 104 or 105 passengers, including five children, plus nine crew members, various state media said.