Capt Adnan Tawfiq of the Iraqi Interior Ministry which deals with compensation issues, has told the Sunday Telegraph that he has received numerous claims from families who allege that their relatives have been shot by private security contractors travelling in road convoys.

He said: "When the security companies kill people they just drive away and nothing is done. Sometimes we ring the companies concerned and they deny everything. The families don't get any money or compensation. I would say we have had about 50-60 incidents of this kind."

In times not too long ago, the term "private security contractor" didn't exist, but the word "mercenary" did.