Traces of radiation have been detected at 12 locations during a probe into the death of former Russian spy Alexander Litvinenko.
Meanwhile, Mr Reid said some 1,700 calls has been made to NHS direct since the radiation scare came to light and 69 people have been referred to the Health Protection Agency as a precaution.
Of the 29 people who have so far been tested, none have returned results of concern to medics. A further 18 have been referred to specialist clinics.
This has become the story of the week, if not the month. This kind of intrigue is rarely seen outside of Hollywood. I just wonder how much bigger it can become.