According to a new book by Ronald Kessler, President Barack Obama is facing 30 death threats a day.

Since Mr Obama took office, the rate of threats against the president has increased 400 per cent from the 3,000 a year or so under President George W. Bush, according to Ronald Kessler, author of In the President’s Secret Service.

Some threats to Mr Obama, whose Secret Service codename is Renegade, have been publicised, including an alleged plot by white supremacists in Tennessee late last year to rob a gun store, shoot 88 black people, decapitate another 14 and then assassinate the first black president in American history.

Most however, are kept under wraps because the Secret Service fears that revealing details of them would only increase the number of copycat attempts. Although most threats are not credible, each one has to be investigated meticulously.