Scientist questions Kennedy lone killer theory

A British forensic scientist says he believes American investigators were wrong to say that only one gunman was involved in the assassination of President John F.

Kennedy in 1963.

The scientist, D.

B.

Thomas, has examined recordings of radio channels used by police in the Texas city of Dallas, where the murder took place.

Official reports say the president was killed by Lee Harvey Oswald, who fired three shots from a book depository.

But Mr Thomas says five separate gunshot sounds can be heard on one of the tapes at exactly the time the president was killed.

Mr Thomas says mistakes were made in synchronising conversations on the two police frequencies, leading earlier investigations to dismiss a theory that a second gunman opened fire from a grassy knoll overlooking the presidential motorcade.

From the newsroom of the BBC World Service