LONDON — The terrorists who committed the atrocities in London on July 7, 2005, seemed to have been of limited education and from relatively poor backgrounds. The four terrorists who were convicted recently of plotting mass murder on the London transport system on July 21, 2005, were refugees from Africa who had been granted asylum in Britain.

Those accused of planting explosives recently in cars outside London nightclubs and of ramming a burning car full of explosives into the terminal at Glasgow airport last month were all educated Muslim men with connections in the British National Health Service. Fortunately the explosive devices failed and mass murder was averted.

One of the accused was an engineer, the other a doctor. Others, apparently involved in the plot, including one suspect detained in Australia, were also in the medical profession. The Hippocratic oath seems to have meant nothing to them.